/* ===== Design tokens ===== */
:root {
  --bg: #0a0b0f;
  --bg-elevated: #11131a;
  --bg-soft: #161922;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.24);
  --text: #e2e8f0;
  --card-copy: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #2d74ec;
  --accent-hover: #5b9aff;
  --accent-deep: #1554f5;
  --accent-gradient: linear-gradient(145deg, #3987f7 0%, #2d74ec 48%, #1554f5 100%);
  --accent-gradient-horizontal: linear-gradient(90deg, #1554f5 0%, #2d74ec 52%, #3987f7 100%);
  --accent-dim: rgba(45, 116, 236, 0.16);
  --accent-gradient-dim: linear-gradient(135deg, rgba(57, 135, 247, 0.2), rgba(21, 84, 245, 0.08));
  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;
  --radius: 6px;
  --radius-lg: 10px;
  --max-width: 1200px;
  --nav-h: 64px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== Reset & base ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-hover);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-gradient);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 2000;
  font-weight: 600;
}

.skip-link:focus {
  top: 0;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  background: rgba(10, 11, 15, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.nav-inner {
  width: 100%;
  max-width: calc(var(--max-width) + 3rem);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-project-title {
  flex: 0 0 auto;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 650;
  line-height: 1.2;
  white-space: nowrap;
}

.nav-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.65rem;
  margin-left: -0.65rem;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.nav-back:hover {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
}

.nav-back:active {
  transform: translateX(-2px);
}

.nav-back span[aria-hidden="true"] {
  font-size: 1rem;
  line-height: 1;
  opacity: 0.72;
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
  gap: 0.65rem;
}

.nav-link {
  display: block;
  padding: 0.5rem 0.72rem;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--text);
  background: var(--accent-dim);
  text-decoration: none;
}

.nav-link.active {
  color: var(--accent-hover);
  background: var(--accent-gradient-dim);
  box-shadow: inset 0 -2px 0 var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0 9px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 900px) {
  .nav-project-title {
    max-width: min(52vw, 15rem);
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-toggle {
    margin-left: auto;
    display: flex;
  }

  .nav-menu {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    background: rgba(10, 11, 15, 0.96);
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm) var(--space-md);
    gap: 0;
    margin: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }

  .nav-link:last-child {
    border-bottom: none;
  }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + var(--space-xl)) var(--space-md) var(--space-xl);
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 70% 30%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 30%, black 0%, transparent 70%);
  pointer-events: none;
}

.hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -20%;
  width: 70vw;
  height: 70vw;
  background: radial-gradient(circle, rgba(57, 135, 247, 0.2) 0%, rgba(21, 84, 245, 0.08) 34%, transparent 64%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  top: 14%;
  right: clamp(-9rem, -5vw, -3rem);
  width: min(48vw, 680px);
  aspect-ratio: 1;
  background:
    radial-gradient(circle at center,
      transparent 0 34%,
      rgba(91, 154, 255, 0.075) 34.2%,
      transparent 34.7% 48%,
      rgba(57, 135, 247, 0.05) 48.2%,
      transparent 48.7%),
    radial-gradient(circle at center,
      rgba(57, 135, 247, 0.07) 0%,
      rgba(21, 84, 245, 0.025) 32%,
      transparent 68%);
  opacity: 0.85;
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(320px, 0.88fr);
  gap: clamp(3rem, 5.5vw, 5rem);
  align-items: center;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
  width: 100%;
  max-width: 680px;
}

.hero-meta {
  color: var(--accent-hover);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 var(--space-sm);
}

.hero-title {
  font-size: clamp(2.6rem, 5.2vw, 4.5rem);
  line-height: 1.08;
  font-weight: 800;
  margin: 0 0 1.25rem;
  letter-spacing: -0.02em;
  max-width: 100%;
  word-break: normal;
  overflow-wrap: anywhere;
}

.hero-lead {
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  color: var(--text-muted);
  margin: 0 0 1.75rem;
  width: 100%;
  max-width: 620px;
  overflow-wrap: anywhere;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: clamp(2.25rem, 4vw, 3.5rem);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--bg-soft);
}

.hero-evidence {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: 100%;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.evidence-item {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding-right: 1.25rem;
}

.evidence-item + .evidence-item {
  padding-left: 1.25rem;
  border-left: 1px solid var(--border);
}

.evidence-num {
  font-size: clamp(1.625rem, 2vw, 2rem);
  font-weight: 800;
  color: var(--accent-hover);
  line-height: 1;
}

.evidence-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.35rem;
}

.hero-media {
  position: relative;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.hero-media .media-frame {
  width: min(100%, 520px);
  margin: 0 auto;
  background: transparent;
  border: 0;
  border-radius: 0;
  overflow: visible;
  cursor: default;
  transform: perspective(1200px) rotateY(-6deg) rotateX(2deg);
  transition: none;
}

.hero-media .media-frame:hover {
  border-color: transparent;
  transform: perspective(1200px) rotateY(-6deg) rotateX(2deg);
}

.hero-media .media-frame img {
  width: 100%;
  max-width: 100%;
  margin: 0;
  filter: drop-shadow(0 28px 48px rgba(0, 0, 0, 0.3));
}

@media (prefers-reduced-motion: reduce) {
  .hero-media .media-frame {
    transform: none;
  }
}

.scroll-hint {
  position: absolute;
  z-index: 1;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  transition: color var(--transition);
}

.scroll-hint:hover {
  color: var(--accent-hover);
  text-decoration: none;
}

.scroll-hint svg {
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

@media (max-width: 1020px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: clamp(3rem, 7vw, 5rem);
  }

  .hero-copy {
    order: 1;
  }

  .hero-media {
    order: 2;
    width: 100%;
  }

  .hero-media .media-frame {
    width: min(78vw, 640px);
    transform: none;
  }

  .hero-media .media-frame img {
    width: 100%;
    margin: 0;
  }

  .hero-evidence {
    gap: var(--space-md);
  }

  .scroll-hint {
    display: none;
  }
}

/* ===== Sections ===== */
.section {
  padding: var(--space-2xl) var(--space-md);
}

.section-dim {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  max-width: 760px;
  margin-bottom: var(--space-xl);
}

.section-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin-bottom: var(--space-xs);
}

.section-num {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.section-label {
  color: var(--text-dim);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 var(--space-sm);
  word-break: keep-all;
  overflow-wrap: break-word;
}

/* Long-form case modules: one section owns several dependent design decisions. */
.experience-map,
.evolution-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(64px, 8vw, 112px);
  border: 1px solid var(--border);
  background: var(--border);
}

.experience-map > a,
.evolution-flow > div {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: clamp(22px, 3vw, 36px);
  background: var(--bg);
}

.experience-map > a {
  position: relative;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition);
}

.experience-map > a::after {
  content: "↓";
  position: absolute;
  right: clamp(22px, 3vw, 36px);
  bottom: clamp(22px, 3vw, 36px);
  color: var(--text-dim);
  font-size: 1rem;
  transition: color var(--transition), transform var(--transition);
}

.experience-map > a:hover {
  background: rgba(45, 116, 236, 0.08);
}

.experience-map > a:hover::after {
  color: var(--accent-hover);
  transform: translateY(3px);
}

.experience-map > a:active {
  background: rgba(45, 116, 236, 0.13);
}

.experience-map > a:focus-visible {
  z-index: 1;
  outline: 2px solid var(--accent-hover);
  outline-offset: -2px;
}

.experience-map span,
.evolution-flow span,
.chapter-index {
  color: var(--accent);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.experience-map strong,
.evolution-flow strong {
  color: var(--text);
  font-size: clamp(18px, 2vw, 24px);
}

.experience-map small,
.evolution-flow small {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.65;
}

.experience-map em {
  margin-top: 14px;
  padding-top: 14px;
  color: var(--text);
  border-top: 1px solid var(--border);
  font-size: 13px;
  font-style: normal;
  font-weight: 600;
}

.experience-map-bridge {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 2.5vw, 28px);
  padding: 14px 20px;
  background: var(--accent-gradient-dim);
}

.experience-map-bridge span {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
}

.experience-map-bridge i {
  color: var(--accent-hover);
  font-style: normal;
}

.case-chapter {
  padding: clamp(56px, 8vw, 104px) 0;
  border-top: 1px solid var(--border);
  scroll-margin-top: calc(var(--nav-h) + 16px);
}

.case-chapter:first-of-type {
  border-top: 0;
}

.chapter-header {
  display: grid;
  grid-template-columns: minmax(100px, .28fr) minmax(240px, .72fr);
  gap: 12px clamp(28px, 5vw, 80px);
  align-items: start;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.chapter-header h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.12;
}

.chapter-header p {
  grid-column: 2;
  max-width: 760px;
  margin: 0;
  color: var(--text-muted);
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.8;
}

.chapter-header-stacked {
  display: block;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.chapter-header-eyebrow {
  margin-bottom: clamp(16px, 2vw, 24px);
}

.chapter-header-stacked h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.12;
}

.chapter-header-stacked p {
  max-width: 820px;
  margin: clamp(16px, 2vw, 24px) 0 0;
  color: var(--text-muted);
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.75;
}

/* Core experience: one parent module with three dependent chapters */
.core-experience-body {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(22, 31, 47, .58), rgba(9, 13, 21, .18) 22%, rgba(9, 13, 21, 0));
  border: 1px solid var(--border);
  border-top-color: rgba(53, 126, 255, .72);
  border-radius: var(--radius-lg);
}

.core-experience .experience-map {
  position: relative;
  z-index: 1;
  margin: 0;
  border: 0;
  border-bottom: 1px solid var(--border);
}

.core-experience .experience-map > a {
  background: rgba(10, 15, 24, .78);
}

.core-experience .experience-map > a:hover {
  background: rgba(39, 83, 155, .18);
}

.core-experience .experience-map-bridge {
  border-top: 1px solid rgba(67, 126, 232, .18);
}

.core-experience .case-chapter {
  position: relative;
  margin: 0;
  padding: clamp(58px, 7vw, 92px) clamp(24px, 4vw, 56px) clamp(58px, 7vw, 92px) clamp(58px, 6vw, 86px);
  border-top: 1px solid var(--border);
}

.core-experience .case-chapter:first-of-type {
  border-top: 0;
}

.core-experience .case-chapter::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: clamp(22px, 2.8vw, 38px);
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 126, 255, .2), rgba(53, 126, 255, .65) 50%, rgba(53, 126, 255, .2));
}

.core-experience .case-chapter::after {
  content: '';
  position: absolute;
  top: clamp(70px, 8.5vw, 110px);
  left: calc(clamp(22px, 2.8vw, 38px) - 5px);
  width: 11px;
  height: 11px;
  background: var(--accent-gradient);
  border: 3px solid var(--bg);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(53, 126, 255, .13);
}

.core-experience .chapter-header-stacked {
  margin-bottom: clamp(36px, 5vw, 64px);
  padding: clamp(20px, 2.8vw, 30px);
  background: linear-gradient(100deg, rgba(30, 62, 111, .2), rgba(15, 21, 32, .42) 70%, transparent);
  border-left: 3px solid rgba(58, 132, 255, .78);
  border-radius: 0 12px 12px 0;
}

.core-experience .chapter-header-eyebrow {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 5px 9px;
  background: rgba(43, 104, 211, .16);
  border: 1px solid rgba(66, 132, 245, .2);
  border-radius: 999px;
}

.core-experience .chapter-header-stacked h3 {
  font-size: clamp(29px, 4vw, 48px);
}

@media (max-width: 760px) {
  .core-experience .case-chapter {
    padding: 48px 18px 54px 42px;
  }
  .core-experience .case-chapter::before { left: 18px; }
  .core-experience .case-chapter::after { left: 13px; top: 64px; }
  .core-experience .chapter-header-stacked { padding: 20px 18px; }
}

/* Annotation: one continuous task across screen and pen */
.annotation-system {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.annotation-flow {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.annotation-flow-intro {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 22px 0 18px;
}

.annotation-flow-intro span,
.annotation-surface header > span,
.annotation-pen-proof figcaption > span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.annotation-flow-intro strong {
  color: var(--text);
  font-size: 18px;
}

.annotation-flow ol {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.annotation-flow li {
  position: relative;
  display: grid;
  align-content: start;
  min-height: 148px;
  padding: 24px 24px 26px 0;
}

.annotation-flow li:not(:last-child)::after {
  content: '→';
  position: absolute;
  top: 47px;
  right: 16px;
  color: var(--primary);
}

.annotation-flow small {
  margin-bottom: 10px;
  color: var(--text-subtle);
  font-size: 12px;
}

.annotation-flow b {
  color: var(--text);
  font-size: 23px;
}

.annotation-flow li > span {
  margin-top: 10px;
  padding-right: 24px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.annotation-proof-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.annotation-surface {
  display: grid;
  grid-template-rows: auto auto;
  gap: 24px;
  padding: clamp(24px, 3vw, 36px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.annotation-surface h3 {
  margin: 10px 0 12px;
  color: var(--text);
  font-size: clamp(21px, 1.9vw, 28px);
  line-height: 1.3;
  white-space: nowrap;
}

.annotation-surface p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.annotation-canvas {
  position: relative;
  min-height: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(145deg, #0d1524, #101d34);
  border: 1px solid rgba(72, 137, 255, 0.25);
  border-radius: 14px;
}

.annotation-contexts,
.annotation-toolbar {
  position: absolute;
  z-index: 1;
  display: flex;
  gap: 8px;
}

.annotation-contexts { top: 18px; left: 18px; }
.annotation-toolbar { right: 18px; bottom: 18px; left: 18px; justify-content: center; }

.annotation-contexts span,
.annotation-toolbar span {
  padding: 7px 11px;
  color: var(--text-muted);
  font-size: 12px;
  background: rgba(7, 12, 22, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 8px;
}

.annotation-canvas svg {
  position: absolute;
  inset: 45px 5% 55px;
  width: 90%;
  height: calc(100% - 100px);
}

.annotation-canvas path {
  fill: none;
  stroke: url('#annotation-stroke');
  stroke: #3d8bff;
  stroke-width: 5;
  stroke-linecap: round;
  opacity: 0.82;
}

.annotation-pen-proof {
  display: grid;
  grid-template-rows: auto auto;
  gap: 24px;
  align-self: start;
  margin: 0;
  padding: clamp(24px, 3vw, 36px);
}

.annotation-pen-proof img {
  order: 2;
  width: 100%;
  height: auto;
  min-height: 0;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  object-position: center;
  background: #fff;
  border-radius: 14px;
}

.annotation-pen-proof figcaption {
  order: 1;
  display: grid;
  gap: 7px;
  padding: 0;
}

.annotation-pen-proof figcaption strong {
  margin: 10px 0 5px;
  color: var(--text);
  font-size: clamp(21px, 1.9vw, 28px);
  line-height: 1.3;
}

.annotation-pen-proof figcaption small {
  color: var(--text-muted);
  font-size: inherit;
  line-height: 1.75;
}

@media (max-width: 900px) {
  .annotation-flow ol { grid-template-columns: 1fr; }
  .annotation-flow li { min-height: 0; padding: 18px 36px 18px 0; border-top: 1px solid var(--border); }
  .annotation-flow li:not(:last-child)::after { top: 50%; right: 8px; transform: translateY(-50%) rotate(90deg); }
  .annotation-proof-grid { grid-template-columns: 1fr; }
  .annotation-surface h3 { white-space: normal; }
  .annotation-pen-proof { grid-template-rows: auto auto; align-self: start; }
  .annotation-pen-proof img { height: auto; min-height: 0; }
}

/* Sidebar: visual decisions → motion proof */
.sidebar-decision-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

/* Design system: evidence → rule → component → acceptance */
.system-explorer {
  display: grid;
  grid-template-columns: minmax(520px, .95fr) minmax(420px, 1.05fr);
  min-height: 620px;
  margin-bottom: 0;
  overflow: hidden;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.system-explorer-orbit {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 50%, rgba(42, 119, 255, .18) 0 16%, transparent 16.5%),
    radial-gradient(circle at 50% 50%, transparent 0 31%, rgba(67, 126, 232, .22) 31.3% 31.6%, transparent 31.9%),
    radial-gradient(circle at 50% 50%, transparent 0 46%, rgba(91, 113, 148, .16) 46.3% 46.6%, transparent 46.9%),
    linear-gradient(145deg, rgba(20, 31, 50, .8), rgba(11, 16, 26, .95));
  border-right: 1px solid var(--border);
}

.system-explorer-core {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-content: center;
  width: 190px;
  height: 190px;
  padding: 20px;
  text-align: center;
  background: linear-gradient(145deg, rgba(31, 77, 155, .92), rgba(16, 42, 85, .95));
  border: 1px solid rgba(74, 139, 255, .6);
  border-radius: 50%;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .32), inset 0 0 35px rgba(70, 137, 255, .16);
  transform: translate(-50%, -50%);
}

.system-explorer-core span,
.system-node > span,
.system-explorer-kicker {
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
}

.system-explorer-core strong {
  margin: 8px 0;
  color: var(--text);
  font-size: 20px;
  line-height: 1.35;
}

.system-explorer-core small,
.system-node small {
  color: var(--text-muted);
  font-size: 11px;
}

.system-node {
  position: absolute;
  z-index: 1;
  display: grid;
  gap: 4px;
  min-width: 154px;
  padding: 14px 16px;
  color: inherit;
  text-align: left;
  cursor: pointer;
  background: rgba(18, 25, 38, .9);
  border: 1px solid rgba(116, 133, 160, .25);
  border-radius: 12px;
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}

.system-node:hover,
.system-node:focus-visible,
.system-node.active {
  background: rgba(28, 52, 91, .94);
  border-color: rgba(70, 137, 255, .75);
  outline: none;
}

.system-node.active { box-shadow: 0 0 0 1px rgba(70, 137, 255, .18), 0 12px 34px rgba(0, 0, 0, .24); }
.system-node strong { color: var(--text); font-size: 15px; }
.system-node-human { top: 7%; left: 50%; transform: translateX(-50%); }
.system-node-human:hover, .system-node-human:focus-visible, .system-node-human.active { transform: translateX(-50%) translateY(-3px); }
.system-node-architecture { top: 29%; left: 5%; }
.system-node-input { top: 29%; right: 5%; }
.system-node-components { right: 8%; bottom: 8%; }
.system-node-content { bottom: 8%; left: 8%; }

.system-explorer-panel {
  display: grid;
  align-content: center;
  min-width: 0;
  padding: clamp(34px, 5vw, 72px);
  background: linear-gradient(160deg, rgba(19, 25, 36, .94), rgba(10, 14, 22, .98));
}

.system-explorer-panel h3 {
  margin: 14px 0 16px;
  color: var(--text);
  font-size: clamp(28px, 3.3vw, 44px);
  line-height: 1.2;
}

.system-explorer-panel > p {
  max-width: 680px;
  margin: 0;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.8;
}

.system-explorer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.system-explorer-tags span {
  padding: 7px 11px;
  color: var(--text-muted);
  font-size: 12px;
  background: rgba(36, 48, 68, .7);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.system-explorer-trace {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr) auto) minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  margin-top: 34px;
  padding: 26px 0;
  border-top: 1px solid var(--border);
}

.system-explorer-trace > div {
  min-width: 0;
  min-height: 112px;
  padding: 18px;
  background: linear-gradient(145deg, rgba(31, 43, 62, .78), rgba(18, 25, 37, .86));
  border: 1px solid rgba(116, 133, 160, .24);
  border-radius: 12px;
}

.system-explorer-trace > div:last-of-type {
  background: linear-gradient(145deg, rgba(28, 61, 112, .8), rgba(17, 38, 73, .9));
  border-color: rgba(70, 137, 255, .48);
}

.system-explorer-trace small {
  display: block;
  margin-bottom: 12px;
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
}

.system-explorer-trace strong {
  display: block;
  color: var(--text);
  font-size: 13px;
  line-height: 1.6;
}

.system-explorer-trace i {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  padding: 0;
  color: var(--primary);
  font-size: 16px;
  font-style: normal;
  background: rgba(42, 119, 255, .12);
  border: 1px solid rgba(70, 137, 255, .28);
  border-radius: 50%;
}

.system-spec-cue {
  width: fit-content;
  margin: 22px auto clamp(36px, 5vw, 64px);
  color: var(--text-subtle);
  font-size: 11px;
  letter-spacing: .04em;
  text-align: center;
  white-space: nowrap;
}

/* Implementation: align standards, validate together, then enter a release. */
.implementation-flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.5vw, 30px);
  margin: 0 0 clamp(48px, 6vw, 80px);
}

.implementation-flow > div {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  grid-template-areas:
    "number title"
    "number description";
  column-gap: 16px;
  row-gap: 8px;
  min-width: 0;
  padding: 22px;
  background: linear-gradient(145deg, rgba(24, 31, 44, .96), rgba(14, 19, 29, .98));
  border: 1px solid var(--border);
  border-radius: 14px;
}

.implementation-flow > div:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: calc(clamp(18px, 2.5vw, 30px) * -.5);
  content: "→";
  color: var(--text-subtle);
  font-size: 18px;
  transform: translate(50%, -50%);
}

.implementation-flow span {
  grid-area: number;
  display: grid;
  place-items: center;
  align-self: start;
  width: 46px;
  height: 46px;
  color: #dbeafe;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  background: linear-gradient(145deg, rgba(42, 119, 255, .72), rgba(25, 65, 132, .88));
  border: 1px solid rgba(88, 151, 255, .55);
  border-radius: 50%;
}

.implementation-flow strong {
  grid-area: title;
  align-self: end;
  color: var(--text);
  font-size: clamp(18px, 1.8vw, 23px);
  line-height: 1.3;
}

.implementation-flow small {
  grid-area: description;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

@media (max-width: 900px) {
  .implementation-flow { grid-template-columns: 1fr; }
  .implementation-flow > div:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: calc(clamp(18px, 2.5vw, 30px) * -.72);
    transform: translate(50%, 50%) rotate(90deg);
  }
}

.implementation-outcome {
  margin-top: clamp(48px, 7vw, 88px);
  padding-top: clamp(28px, 4vw, 42px);
  border-top: 1px solid rgba(61, 139, 255, .55);
}

.implementation-outcome > header {
  display: grid;
  justify-items: start;
  gap: 10px;
  margin-bottom: clamp(24px, 3.5vw, 38px);
  text-align: left;
}

.implementation-outcome > header span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
}

.implementation-outcome > header h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(22px, 2.4vw, 32px);
  line-height: 1.35;
}

.implementation-outcome-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 14px 14px 0 0;
}

.implementation-outcome-grid > div {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  grid-template-areas:
    "index title"
    ". copy";
  column-gap: 14px;
  row-gap: 12px;
  align-content: start;
  min-width: 0;
  padding: clamp(22px, 3vw, 32px);
  background: var(--surface);
}

.implementation-outcome-grid span {
  grid-area: index;
  align-self: baseline;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .08em;
}

.implementation-outcome-grid strong {
  grid-area: title;
  align-self: baseline;
  color: var(--text);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.35;
}

.implementation-outcome-grid small {
  grid-area: copy;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.implementation-outcome-result {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 20px clamp(22px, 3vw, 32px);
  background: linear-gradient(90deg, rgba(27, 62, 119, .72), rgba(14, 30, 57, .88));
  border: 1px solid rgba(70, 137, 255, .38);
  border-top: 0;
  border-radius: 0 0 14px 14px;
}

.implementation-outcome-result strong {
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  text-align: left;
}

@media (max-width: 760px) {
  .implementation-outcome-grid { grid-template-columns: 1fr; }
}

@media (max-width: 980px) {
  .system-explorer { grid-template-columns: 1fr; }
  .system-explorer-orbit { min-height: 560px; border-right: 0; border-bottom: 1px solid var(--border); }
  .system-explorer-panel { min-height: 500px; }
}

.system-spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 28px);
}

.system-spec-card {
  display: grid;
  grid-template-rows: 420px auto;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.system-spec-card-wide {
  grid-column: 1 / -1;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  grid-template-rows: minmax(430px, auto);
}

.system-spec-card img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  object-fit: contain;
  object-position: top center;
  background: #0f1218;
}

.system-spec-card figcaption {
  display: grid;
  align-content: center;
  gap: 8px;
  padding: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--border);
}

.system-spec-card-wide figcaption {
  border-top: 0;
  border-left: 1px solid var(--border);
}

.system-spec-card figcaption span {
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.system-spec-card figcaption strong {
  color: var(--text);
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.35;
}

.system-spec-card figcaption small {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.75;
}

@media (max-width: 760px) {
  .system-explorer { min-height: 0; }
  .system-explorer-orbit { min-height: 660px; }
  .system-explorer-core { width: 158px; height: 158px; }
  .system-node { min-width: 138px; padding: 12px; }
  .system-node-architecture { left: 3%; }
  .system-node-input { right: 3%; }
  .system-node-components { right: 4%; }
  .system-node-content { left: 4%; }
  .system-explorer-panel { min-height: 0; padding: 30px 22px; }
  .system-explorer-trace { grid-template-columns: 1fr; gap: 12px; }
  .system-explorer-trace i { justify-self: center; transform: rotate(90deg); }
  .system-spec-grid { grid-template-columns: 1fr; }
  .system-spec-card,
  .system-spec-card-wide {
    grid-column: auto;
    grid-template-columns: 1fr;
    grid-template-rows: minmax(280px, 58vw) auto;
  }
  .system-spec-card-wide figcaption { border-top: 1px solid var(--border); border-left: 0; }
}

.sidebar-decision {
  min-width: 0;
  padding: clamp(1.25rem, 2.6vw, 2rem);
  background: var(--bg-soft);
}

.decision-index,
.sidebar-motion-head > div:first-child > span,
.motion-demo figcaption > span {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--accent-hover);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: .1em;
}

.decision-graphic {
  position: relative;
  height: clamp(88px, 10vw, 124px);
  margin: 1rem 0 1.2rem;
  overflow: hidden;
  background: radial-gradient(circle at 50% 50%, rgba(45, 116, 236, 0.09), transparent 68%);
}

.decision-graphic::before,
.decision-graphic::after,
.decision-graphic i {
  content: "";
  position: absolute;
  display: block;
}

.is-discover::before {
  top: 50%;
  left: 20%;
  width: 8px;
  height: 8px;
  background: var(--text-dim);
  border-radius: 50%;
  transform: translateY(-50%);
}

.is-discover::after {
  top: 50%;
  right: 22%;
  width: 42px;
  height: 42px;
  background: linear-gradient(145deg, #2d74ec, #075cff);
  border-radius: 50% 50% 50% 18%;
  box-shadow: 0 0 0 12px rgba(45, 116, 236, 0.1), 0 0 30px rgba(45, 116, 236, 0.22);
  transform: translateY(-50%) rotate(45deg);
}

.is-discover i {
  top: 50%;
  left: calc(20% + 18px);
  right: calc(22% + 54px);
  height: 1px;
  background: linear-gradient(90deg, var(--text-dim), var(--accent-hover));
}

.is-path::before {
  top: 50%;
  left: 14%;
  right: 14%;
  height: 2px;
  background: linear-gradient(90deg, rgba(115, 130, 153, 0.3), var(--accent-hover));
}

.is-path::after {
  top: 50%;
  left: 14%;
  right: 14%;
  height: 18px;
  background:
    radial-gradient(circle at 0 50%, var(--text-dim) 0 6px, transparent 7px),
    radial-gradient(circle at 50% 50%, rgba(115, 130, 153, 0.7) 0 6px, transparent 7px),
    radial-gradient(circle at 100% 50%, var(--accent-hover) 0 7px, transparent 8px);
  transform: translateY(-50%);
}

.is-path i {
  top: calc(50% - 15px);
  right: 14%;
  width: 28px;
  height: 28px;
  border: 1px solid var(--accent-hover);
  border-radius: 50%;
}

.is-feedback::before {
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  background: var(--accent-hover);
  border-radius: 50%;
  box-shadow: 0 0 0 14px rgba(45, 116, 236, 0.14), 0 0 0 30px rgba(45, 116, 236, 0.06);
  transform: translate(-50%, -50%);
}

.is-feedback::after {
  top: 50%;
  left: 18%;
  right: 18%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-hover), transparent);
}

.decision-shift {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.8rem;
  font-size: 0.78rem;
}

.decision-shift del {
  color: var(--text-dim);
  text-decoration-color: rgba(115, 130, 153, 0.65);
}

.decision-shift i {
  color: var(--accent-hover);
  font-style: normal;
}

.decision-shift strong {
  color: var(--accent-hover);
  font-weight: 650;
}

.sidebar-decision h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.05rem, 1.7vw, 1.28rem);
  line-height: 1.45;
}

.sidebar-decision p {
  margin: 0.35rem 0 0;
  color: var(--text-dim);
  font-size: 0.82rem;
  line-height: 1.55;
}

.sidebar-motion-section {
  margin-top: clamp(44px, 6vw, 76px);
}

.sidebar-motion-head {
  display: grid;
  grid-template-columns: minmax(240px, .75fr) minmax(0, 1.25fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: end;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.sidebar-motion-head > div:first-child > span {
  margin-bottom: 0.5rem;
}

.sidebar-motion-section h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.4;
}

.motion-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

.motion-flow i {
  color: var(--accent-hover);
  font-style: normal;
}

.sidebar-motion-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}

.motion-demo {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  background: #080a0f;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.motion-demo video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #05070b;
}

.motion-demo figcaption {
  display: block;
  padding: 1rem 1.15rem 1.2rem;
  border-top: 1px solid var(--border);
}

.motion-demo figcaption > span {
  margin-bottom: 0.4rem;
}

.motion-demo figcaption strong,
.motion-demo figcaption small {
  display: block;
}

.motion-demo figcaption strong {
  color: var(--text);
  font-size: 1rem;
}

.motion-demo figcaption small {
  margin-top: 0.35rem;
  color: var(--text-dim);
  font-size: 0.82rem;
  line-height: 1.55;
}

@media (max-width: 760px) {
  .sidebar-decision-grid,
  .sidebar-motion-head,
  .sidebar-motion-grid {
    grid-template-columns: 1fr;
  }

  .motion-flow {
    margin-top: 0.25rem;
  }
}

.home-decision-visual {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  grid-template-areas:
    "heading rules"
    "figure rules";
  gap: 0 clamp(28px, 4vw, 52px);
  padding: clamp(22px, 3vw, 36px);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.home-visual-heading {
  grid-area: heading;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: baseline;
  padding-bottom: 1rem;
}

.home-visual-heading > span,
.home-rules-heading > span {
  color: var(--accent-hover);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: .12em;
}

.home-visual-heading > strong,
.home-rules-heading > strong {
  color: var(--text);
  font-size: 0.95rem;
}

.home-visual-heading > small {
  color: var(--text-dim);
  font-size: 0.78rem;
}

.home-decision-visual > figure {
  grid-area: figure;
}

.home-decision-rules {
  grid-area: rules;
  position: relative;
  padding-left: clamp(24px, 3vw, 40px);
  border-left: 1px solid var(--border-strong);
}

.home-decision-rules::before {
  content: "→";
  position: absolute;
  top: 50%;
  left: 0;
  width: 2rem;
  color: var(--accent-hover);
  background: var(--bg-soft);
  text-align: center;
  transform: translate(-50%, -50%);
}

.home-rules-heading {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.home-decision-rules ol {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border);
}

.home-decision-rules li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.65rem;
  align-items: start;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}

.home-decision-rules li > span {
  color: var(--accent-hover);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.home-decision-rules li strong,
.home-decision-rules li small {
  display: block;
}

.home-decision-rules li strong {
  color: var(--text);
  font-size: 0.9rem;
}

.home-decision-rules li small {
  margin-top: 0.25rem;
  color: var(--text-dim);
  font-size: 0.78rem;
  line-height: 1.5;
}

@media (max-width: 900px) {
  .home-decision-visual {
    grid-template-columns: 1fr;
    grid-template-areas:
      "heading"
      "figure"
      "rules";
    gap: 1.5rem;
  }

  .home-decision-rules {
    padding: 1.5rem 0 0;
    border-top: 1px solid var(--border-strong);
    border-left: 0;
  }

  .home-decision-rules::before {
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%) rotate(90deg);
  }
}

.evolution-flow {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  background: transparent;
  border: 0;
}

.evolution-flow > div {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.evolution-flow > i {
  align-self: center;
  padding: 0 10px;
  color: var(--accent);
  font-size: 24px;
  font-style: normal;
}

.ai-experience-plan {
  margin-top: clamp(34px, 5vw, 72px);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 24px;
  background:
    radial-gradient(circle at 50% 0, rgba(42, 119, 255, .12), transparent 34%),
    rgba(13, 18, 27, .76);
}

.ai-plan-intro {
  max-width: 980px;
  padding: clamp(32px, 5vw, 64px);
}

.ai-plan-intro > span,
.ai-scene-step {
  color: var(--accent);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.ai-plan-intro h3 {
  max-width: 900px;
  margin: 14px 0 16px;
  font-size: clamp(1.65rem, 3vw, 2.65rem);
  line-height: 1.22;
}

.ai-plan-intro p {
  max-width: 850px;
  margin: 0;
  color: var(--text-muted);
  line-height: 1.8;
}

.ai-plan-axis {
  display: grid;
  grid-template-columns: auto minmax(42px, 1fr) auto minmax(42px, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 22px clamp(32px, 5vw, 64px);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(18, 27, 42, .72);
}

.ai-plan-axis span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: .9rem;
  white-space: nowrap;
}

.ai-plan-axis b { color: var(--accent); }

.ai-plan-axis i {
  height: 1px;
  background: linear-gradient(90deg, rgba(61, 139, 255, .72), rgba(61, 139, 255, .12));
}

.ai-plan-scenes {
  margin: 0;
  padding: 0;
  list-style: none;
}

.ai-plan-scene {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, .88fr);
  min-height: 480px;
  border-bottom: 1px solid var(--border);
}

.ai-plan-scene:last-child { border-bottom: 0; }

.ai-plan-scene-reverse .ai-scene-visual { order: 2; }
.ai-plan-scene-reverse .ai-scene-copy { order: 1; }

.ai-scene-visual {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-width: 0;
  margin: 0;
  padding: clamp(20px, 3vw, 36px);
  background: #f5f7fa;
}

.ai-scene-visual img {
  width: 100%;
  height: 100%;
  min-height: 330px;
  object-fit: contain;
  background: #fff;
}

.ai-scene-visual figcaption {
  padding-top: 16px;
  color: #64748b;
  font-size: .82rem;
}

.ai-scene-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
  padding: clamp(32px, 5vw, 64px);
  background: rgba(18, 24, 35, .72);
}

.ai-scene-copy h3 {
  margin: 0;
  font-size: clamp(1.45rem, 2.3vw, 2.1rem);
  line-height: 1.35;
}

.ai-scene-copy > p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.ai-scene-capabilities {
  display: grid;
  gap: 0;
  margin: 8px 0 0;
  border-top: 1px solid var(--border);
}

.ai-scene-capabilities > div {
  display: grid;
  grid-template-columns: minmax(145px, .42fr) minmax(0, 1fr);
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.ai-scene-capabilities dt {
  color: #dce8ff;
  font-weight: 700;
}

.ai-scene-capabilities dd {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.65;
}

@media (max-width: 980px) {
  .ai-plan-axis { grid-template-columns: 1fr; gap: 10px; }
  .ai-plan-axis i { width: 1px; height: 18px; margin-left: 11px; }
  .ai-plan-scene { grid-template-columns: 1fr; }
  .ai-plan-scene-reverse .ai-scene-visual,
  .ai-plan-scene-reverse .ai-scene-copy { order: initial; }
  .ai-scene-visual img { min-height: 260px; }
}

@media (max-width: 620px) {
  .ai-experience-plan { border-radius: 18px; }
  .ai-plan-intro,
  .ai-scene-copy { padding: 28px 22px; }
  .ai-plan-axis { padding: 20px 22px; }
  .ai-scene-visual { padding: 14px; }
  .ai-scene-visual img { min-height: 210px; }
  .ai-scene-capabilities > div { grid-template-columns: 1fr; gap: 8px; }
}

.section-lead {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin: 0;
}

/* ===== Grids & cards ===== */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.align-start {
  align-items: start;
}

@media (max-width: 800px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.card h3,
.card-accent h3 {
  margin-top: 0;
  font-size: 1.1rem;
  color: var(--text);
}

.overview-flow .card p {
  color: var(--card-copy);
}

.overview-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: clamp(0.75rem, 1.6vw, 1.5rem);
  align-items: stretch;
}

.overview-step {
  min-width: 0;
  transition: none;
}

.overview-step:hover {
  border-color: var(--border);
  transform: none;
}

.overview-step-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.overview-step-meta span {
  display: grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  flex: 0 0 auto;
  border: 1px solid rgba(91, 154, 255, 0.42);
  border-radius: 50%;
  color: var(--accent-hover);
  background: var(--accent-gradient-dim);
  font-size: 0.72rem;
  font-weight: 750;
}

.overview-step-meta small {
  color: var(--text-dim);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.12em;
}

.overview-arrow {
  align-self: center;
  color: rgba(91, 154, 255, 0.58);
  font-size: 1.2rem;
}

.overview-drop {
  display: grid;
  justify-items: center;
  gap: 0.2rem;
  margin: 1.1rem 0 0.75rem;
  color: var(--text-dim);
}

.overview-drop span {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.overview-drop b {
  color: rgba(91, 154, 255, 0.58);
  font-size: 1.1rem;
  font-weight: 500;
}

.overview-method {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.8fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  align-items: center;
  padding: clamp(1.35rem, 2.5vw, 2rem);
  border: 1px solid rgba(91, 154, 255, 0.22);
  border-radius: var(--radius-lg);
  background: linear-gradient(110deg, rgba(45, 116, 236, 0.1), var(--bg-soft) 42%);
}

.overview-method-heading .overview-step-meta {
  margin-bottom: 0.7rem;
}

.overview-method h3 {
  margin: 0 0 0.55rem;
  color: var(--text);
  font-size: 1.1rem;
}

.overview-method-heading > p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.method-chain {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr) auto) minmax(0, 1fr);
  align-items: center;
  gap: 0.55rem;
}

.method-chain span {
  min-width: 0;
  padding: 0.75rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--card-copy);
  background: rgba(11, 15, 22, 0.55);
  font-size: 0.78rem;
  font-weight: 650;
  text-align: center;
}

.method-chain i {
  color: rgba(91, 154, 255, 0.58);
  font-size: 0.9rem;
  font-style: normal;
}

@media (max-width: 800px) {
  .overview-flow {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .overview-arrow {
    justify-self: center;
    transform: rotate(90deg);
  }

  .overview-method {
    grid-template-columns: 1fr;
  }

  .method-chain {
    grid-template-columns: 1fr;
  }

  .method-chain i {
    justify-self: center;
    transform: rotate(90deg);
  }
}

.card-accent {
  background: var(--accent-gradient-dim);
  border: 1px solid rgba(45, 116, 236, 0.34);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
}

.block {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  margin-top: var(--space-lg);
}

.block h3 {
  margin-top: 0;
}

/* ===== Lists ===== */
.plain-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.plain-list li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.6rem;
  color: var(--text-muted);
}

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 5px;
  height: 5px;
  background: var(--accent-gradient);
  border-radius: 50%;
}

.metric-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.metric-list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.metric-list li:last-child {
  border-bottom: none;
}

.metric-list span {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-hover);
  min-width: 3.5rem;
}

/* ===== Callouts ===== */
.callout {
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  padding: var(--space-md);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--space-lg) 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.callout strong {
  color: var(--text);
}

.callout-note {
  border-left-color: var(--text-dim);
}

.callout-conclusion {
  border-left-color: var(--accent);
  background: var(--accent-gradient-dim);
}

.callout-goal {
  border-left-color: var(--warning);
  background: rgba(251, 191, 36, 0.08);
}

/* ===== Research evidence chain ===== */
.research-rationale {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: var(--space-xl) 0 0;
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border);
}

.research-rationale-step {
  position: relative;
  padding: clamp(1.35rem, 3vw, 2rem) clamp(1rem, 2.4vw, 1.75rem);
}

.research-rationale-step + .research-rationale-step {
  border-left: 1px solid var(--border);
}

.research-rationale-step + .research-rationale-step::before {
  content: "→";
  position: absolute;
  top: 50%;
  left: 0;
  width: 1.8rem;
  color: var(--accent-hover);
  background: var(--bg-elevated);
  text-align: center;
  transform: translate(-50%, -50%);
}

.research-rationale-step > span,
.research-findings-intro > span,
.research-decision > div > span,
.research-evidence-label > span,
.research-method-title > span {
  display: block;
  margin-bottom: 0.65rem;
  color: var(--accent-hover);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.research-rationale-step strong {
  display: block;
  color: var(--text);
  font-size: clamp(1rem, 1.65vw, 1.22rem);
  line-height: 1.45;
}

.research-rationale-step p {
  margin: 0.65rem 0 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.research-question {
  background: linear-gradient(135deg, rgba(45, 116, 236, 0.12), rgba(45, 116, 236, 0.03));
}

.research-method {
  display: grid;
  grid-template-columns: minmax(15rem, 1.2fr) 2fr;
  align-items: stretch;
  margin-top: var(--space-lg);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.research-method-title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-md);
  border-right: 1px solid var(--border);
}

.research-method-title > span {
  margin-bottom: 0.45rem;
}

.research-method-title strong {
  color: var(--text);
  line-height: 1.65;
}

.research-method dl {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
}

.research-method dl > div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 7.5rem;
  padding: 1rem;
  text-align: center;
}

.research-method dl > div + div {
  border-left: 1px solid var(--border);
}

.research-method dt {
  color: var(--accent-hover);
  font-size: clamp(1.55rem, 2.8vw, 2.2rem);
  font-weight: 750;
  line-height: 1;
}

.research-method dd {
  margin: 0.55rem 0 0;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.research-findings {
  display: grid;
  grid-template-columns: minmax(15rem, 0.85fr) 2fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: end;
  padding: clamp(2.75rem, 6vw, 5rem) 0;
}

.research-findings-intro h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.4;
}

.research-findings-intro p {
  margin: 0.9rem 0 0;
  color: var(--text-dim);
  font-size: 0.92rem;
}

.research-finding-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.8vw, 2rem);
}

.research-finding {
  padding-top: 1rem;
  border-top: 2px solid rgba(91, 154, 255, 0.48);
}

.research-finding strong,
.research-finding span,
.research-finding small {
  display: block;
}

.research-finding strong {
  color: var(--accent-hover);
  font-size: clamp(2.1rem, 4vw, 3.4rem);
  line-height: 1;
}

.research-finding span {
  margin-top: 0.75rem;
  color: var(--text);
  font-weight: 650;
}

.research-finding small {
  margin-top: 0.35rem;
  color: var(--text-dim);
  line-height: 1.55;
}

.research-decision {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  padding: clamp(1.5rem, 3.5vw, 2.5rem);
  background: var(--accent-gradient-dim);
  border: 1px solid rgba(91, 154, 255, 0.34);
  border-radius: var(--radius-lg);
}

.research-decision h3 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.25rem, 2.3vw, 1.8rem);
}

.research-decision p {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
}

.research-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border-strong);
  border-left: 1px solid var(--border-strong);
}

.research-actions li {
  padding: 0.8rem 0.9rem;
  color: var(--text-muted);
  border-right: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  font-size: 0.86rem;
}

.research-evidence-label {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  margin: var(--space-xl) 0 var(--space-md);
}

.research-evidence-label > span {
  flex: 0 0 auto;
  margin: 0;
}

.research-evidence-label p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.88rem;
}

@media (max-width: 900px) {
  .research-method,
  .research-findings,
  .research-decision {
    grid-template-columns: 1fr;
  }

  .research-method-title {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 680px) {
  .research-rationale {
    grid-template-columns: 1fr;
  }

  .research-rationale-step + .research-rationale-step {
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .research-rationale-step + .research-rationale-step::before {
    top: 0;
    left: 1.75rem;
    transform: translateY(-50%) rotate(90deg);
  }

  .research-method dl,
  .research-finding-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .research-method dl > div:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--border);
  }

  .research-method dl > div:nth-child(4) {
    border-top: 1px solid var(--border);
  }

  .research-finding:last-child {
    grid-column: 1 / -1;
  }

  .research-evidence-label {
    display: block;
  }

  .research-evidence-label p {
    margin-top: 0.45rem;
  }
}

/* ===== Strategy layers ===== */
.challenge-response {
  position: relative;
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--border);
}

.challenge-response::before {
  content: "";
  position: absolute;
  top: -1.5rem;
  left: 50%;
  width: 1px;
  height: 1.5rem;
  background: linear-gradient(180deg, rgba(91, 154, 255, 0.55), var(--border));
}

.challenge-response::after {
  content: "";
  position: absolute;
  top: -0.2rem;
  left: 50%;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--accent-gradient);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 14px rgba(45, 116, 236, 0.4);
}

.strategy-intro {
  max-width: 680px;
  margin: 0 auto clamp(1.5rem, 3vw, 2rem);
  text-align: center;
}

.strategy-intro span {
  color: var(--accent-hover);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.strategy-intro p {
  margin: 0.55rem 0 0;
  color: var(--card-copy);
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  line-height: 1.7;
}

.strategy-layers {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-bottom: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid rgba(91, 154, 255, 0.26);
}

.layer {
  display: grid;
  grid-template-columns: auto 1fr;
  align-content: start;
  gap: 0.7rem;
  min-width: 0;
  padding: 1.25rem clamp(0.8rem, 2vw, 1.35rem) 0.5rem;
}

.layer + .layer {
  border-left: 1px solid var(--border);
}

.layer-num {
  display: grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 50%;
  background: var(--accent-gradient-dim);
  color: var(--accent-hover);
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.layer h3 {
  margin: 0.1rem 0 0.35rem;
  font-size: 0.95rem;
}

.layer p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.78rem;
  line-height: 1.65;
}

.principles {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.55rem;
}

.principles-label {
  margin-right: 0.35rem;
  color: var(--text-dim);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.principle {
  padding: 0.38rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--card-copy);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

@media (max-width: 900px) {
  .strategy-layers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .layer:nth-child(3) {
    border-left: 0;
  }

  .layer:nth-child(n + 3) {
    border-top: 1px solid var(--border);
  }
}

@media (max-width: 560px) {
  .strategy-layers {
    grid-template-columns: 1fr;
  }

  .layer + .layer {
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .principles-label {
    flex-basis: 100%;
    margin: 0 0 0.2rem;
    text-align: center;
  }
}

/* ===== Challenge ===== */
.constraint-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(0.75rem, 1.6vw, 1.25rem);
}

.constraint-node {
  min-width: 0;
  padding: clamp(1rem, 2vw, 1.35rem);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.constraint-heading {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.constraint-heading > span {
  color: var(--accent-hover);
  font-size: 0.72rem;
  font-weight: 750;
}

.constraint-heading h3 {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
}

.constraint-visual {
  min-height: 4.5rem;
  margin-bottom: 0.85rem;
}

.constraint-space {
  display: grid;
  grid-template-columns: auto minmax(2rem, 1fr) auto;
  align-items: center;
  gap: 0.55rem;
}

.constraint-space span {
  color: var(--card-copy);
  font-size: 0.72rem;
  font-weight: 650;
}

.constraint-space i {
  height: 1px;
  background: linear-gradient(90deg, rgba(91, 154, 255, 0.25), var(--accent-hover));
  position: relative;
}

.constraint-space i::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 0;
  width: 0.45rem;
  height: 0.45rem;
  border: 1px solid var(--accent-hover);
  border-radius: 50%;
  transform: translateY(-50%);
  background: var(--bg-soft);
}

.constraint-path {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
}

.constraint-path span {
  padding: 0.35rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  color: var(--card-copy);
  font-size: 0.62rem;
}

.constraint-path i {
  color: rgba(91, 154, 255, 0.62);
  font-size: 0.62rem;
  font-style: normal;
}

.constraint-inputs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.constraint-inputs span {
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--card-copy);
  font-size: 0.65rem;
}

.constraint-products {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  align-items: end;
  gap: 0.3rem;
}

.constraint-products span {
  display: grid;
  place-items: end center;
  min-height: 2.5rem;
  padding: 0.35rem 0.1rem;
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  color: var(--card-copy);
  background: linear-gradient(180deg, rgba(45, 116, 236, 0.14), transparent);
  font-size: 0.55rem;
}

.constraint-products span:nth-child(2) { min-height: 3.7rem; }
.constraint-products span:nth-child(3) { min-height: 3rem; }
.constraint-products span:nth-child(4) { min-height: 3.4rem; }
.constraint-products span:nth-child(5) { min-height: 2.3rem; }

.constraint-node > small {
  display: block;
  color: var(--text-muted);
  font-size: 0.72rem;
  text-align: center;
}

.challenge-core {
  position: relative;
  max-width: 720px;
  margin: clamp(1.25rem, 3vw, 2rem) auto 0;
  padding: clamp(1rem, 2.5vw, 1.35rem) clamp(1.25rem, 4vw, 2.5rem) clamp(1.35rem, 3vw, 1.75rem);
  border-top: 1px solid rgba(91, 154, 255, 0.35);
  border-bottom: 1px solid rgba(91, 154, 255, 0.14);
  text-align: center;
}

.challenge-core::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 6rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-hover), transparent);
}

.challenge-core span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.challenge-core strong {
  display: block;
  color: var(--text);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
}

.challenge-core p {
  max-width: 560px;
  margin: 0.55rem auto 0;
  color: var(--card-copy);
  font-size: 0.88rem;
  line-height: 1.7;
}

.challenge-outcome-label {
  margin: 0 auto;
  padding: 0.9rem 1rem 0.2rem;
  color: var(--text-dim);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-align: center;
  text-transform: uppercase;
}

.risk-constellation {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  position: relative;
  max-width: 880px;
  margin: 0.25rem auto 0;
  padding: clamp(1.75rem, 4vw, 2.75rem) 0;
}

.risk-constellation::before {
  content: "";
  position: absolute;
  inset: clamp(1.25rem, 3vw, 2rem) 0;
  background:
    linear-gradient(180deg, transparent calc(50% - 0.5px), rgba(91, 154, 255, 0.14) calc(50% - 0.5px), rgba(91, 154, 255, 0.14) calc(50% + 0.5px), transparent calc(50% + 0.5px)),
    linear-gradient(90deg, transparent calc(50% - 0.5px), rgba(91, 154, 255, 0.14) calc(50% - 0.5px), rgba(91, 154, 255, 0.14) calc(50% + 0.5px), transparent calc(50% + 0.5px));
  pointer-events: none;
}

.risk-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  background: var(--bg-elevated);
  text-align: center;
}

.risk-core-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 18px rgba(45, 116, 236, 0.5);
}

.risk-core-label {
  color: var(--text-dim);
  font-size: 0.62rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.risk-node {
  position: relative;
  z-index: 1;
  padding: clamp(1rem, 2.5vw, 1.6rem) clamp(1.25rem, 4vw, 2.5rem);
  text-align: center;
}

.risk-node-tl { align-self: end; justify-self: end; }
.risk-node-tr { align-self: end; justify-self: start; }
.risk-node-bl { align-self: start; justify-self: end; }
.risk-node-br { align-self: start; justify-self: start; }

.risk-node .risk-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
  justify-content: center;
}

.risk-title svg {
  flex: 0 0 auto;
  width: 1.1rem;
  height: 1.1rem;
  fill: none;
  stroke: var(--accent-hover);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.risk-title strong {
  color: var(--text);
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  font-weight: 650;
}

.risk-node p {
  max-width: 240px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: clamp(0.78rem, 1.1vw, 0.85rem);
  line-height: 1.65;
}

@media (max-width: 900px) {
  .constraint-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .challenge-core {
    margin-top: 1rem;
  }

  .risk-node p {
    max-width: 200px;
  }
}

@media (max-width: 640px) {
  .risk-constellation {
    display: block;
    padding: 1.25rem 0 0.25rem;
  }

  .risk-constellation::before {
    display: none;
  }

  .risk-core {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    margin: 0 auto 1.25rem;
    padding: 0;
    background: transparent;
  }

  .risk-node {
    padding: 0.65rem 0 0.65rem 1.6rem;
    margin-bottom: 0.35rem;
    text-align: left;
  }

  .risk-node::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.78rem;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-gradient);
    box-shadow: 0 0 10px rgba(45, 116, 236, 0.35);
  }

  .risk-node .risk-title {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 0.15rem;
  }

  .risk-node p {
    max-width: none;
    margin: 0;
    padding-left: 1.6rem;
  }
}

@media (max-width: 560px) {
  .constraint-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Media frames ===== */
.media-frame {
  position: relative;
  margin: 0;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: zoom-in;
  transition: border-color var(--transition), transform var(--transition);
}

.research-slide-header {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(0.55rem, 1.4vw, 1.1rem);
  width: 100%;
  height: 12.55%;
  padding: 0 2.2%;
  color: #111;
  background: linear-gradient(110deg, rgba(248, 248, 248, 0.99), rgba(252, 252, 252, 0.99) 45%, rgba(246, 246, 246, 0.99));
  font-family: Arial, "PingFang SC", sans-serif;
  line-height: 1;
  box-sizing: border-box;
  pointer-events: none;
}

.research-slide-index {
  font-size: clamp(0.72rem, 1.35vw, 1.2rem);
  font-weight: 700;
  white-space: nowrap;
}

.research-slide-title {
  overflow: hidden;
  font-size: clamp(0.62rem, 1.05vw, 1rem);
  font-weight: 600;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.research-slide-logo {
  position: relative;
  padding-bottom: 0.16rem;
  font-size: clamp(0.74rem, 1.35vw, 1.2rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.research-slide-logo i {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 42%;
  height: 1px;
  background: currentColor;
  transform: translateX(-50%);
}

.media-frame:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.media-frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.media-frame figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.media-grid {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.media-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.media-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 900px) {
  .media-grid-2,
  .media-grid-3 {
    grid-template-columns: 1fr;
  }
}

/* ===== Governance stats ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  text-align: center;
  transition: border-color var(--transition);
}

.stat-card:hover {
  border-color: var(--border-strong);
}

.stat-num {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent-hover);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-meta,
.evidence-num,
.section-num,
.experience-map span,
.evolution-flow span,
.chapter-index,
.metric-list span,
.stat-num {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@media (max-width: 700px) {
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Breakdown bars ===== */
.breakdown {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 48px);
  margin: var(--space-xl) 0;
}

.breakdown-group {
  min-width: 0;
  padding: clamp(22px, 3vw, 32px);
  background: rgba(20, 26, 37, .7);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.breakdown-group h3 {
  margin: 0 0 clamp(24px, 3vw, 34px);
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 600;
}

.bar-set {
  display: grid;
  gap: clamp(16px, 2vw, 22px);
}

.bar {
  display: grid;
  grid-template-columns: minmax(52px, 4rem) minmax(100px, 1fr) 42px;
  align-items: center;
  gap: clamp(12px, 1.8vw, 20px);
  min-width: 0;
}

.bar-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.bar-fill {
  height: 8px;
  width: 100%;
  background: linear-gradient(90deg,
    #2468f2 0,
    #438ff7 var(--value),
    rgba(83, 101, 129, .2) var(--value),
    rgba(83, 101, 129, .2) 100%);
  border-radius: 4px;
}

.bar-num {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 700px) {
  .breakdown {
    grid-template-columns: 1fr;
  }

  .breakdown-group { padding: 20px; }
  .bar { grid-template-columns: 48px minmax(80px, 1fr) 38px; gap: 10px; }
}

/* ===== Outcome ===== */
#outcome {
  background: #071226;
}

.outcome-system {
  position: relative;
  margin-bottom: var(--space-xl);
}

.outcome-system::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -30px;
  width: 1px;
  height: 30px;
  background: linear-gradient(var(--accent), rgba(42, 119, 255, 0));
}

.outcome-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 88px minmax(0, 1fr) 88px minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
}

.outcome-block {
  position: relative;
  min-width: 0;
  background: linear-gradient(145deg, rgba(15, 35, 67, .96), rgba(9, 24, 48, .98));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 2.5vw, 36px);
  overflow: hidden;
}

.outcome-block h3 {
  margin: 0 0 22px;
  font-size: clamp(1.35rem, 2vw, 1.75rem);
}

.outcome-kicker {
  margin-bottom: 8px;
  color: var(--accent-hover);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
}

.outcome-block .plain-list {
  position: relative;
  z-index: 1;
  margin-bottom: 0;
}

.outcome-visual {
  position: relative;
  width: 100%;
  height: 88px;
  margin-bottom: 24px;
  border-bottom: 1px solid rgba(94, 134, 196, .22);
}

.outcome-visual span {
  position: absolute;
  display: block;
  border: 1px solid rgba(78, 141, 255, .58);
  background: rgba(42, 119, 255, .09);
}

.outcome-product .outcome-visual span:nth-child(1) { left: 0; top: 30px; width: 29%; height: 32px; border-radius: 5px; }
.outcome-product .outcome-visual span:nth-child(2) { left: 35%; top: 16px; width: 29%; height: 46px; border-radius: 5px; }
.outcome-product .outcome-visual span:nth-child(3) { right: 0; top: 25px; width: 29%; height: 37px; border-radius: 5px; }
.outcome-product .outcome-visual span:nth-child(4) { left: 8%; right: 8%; bottom: 8px; height: 2px; border: 0; background: var(--accent-gradient); }

.outcome-user .outcome-visual::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  top: 44px;
  height: 1px;
  background: rgba(78, 141, 255, .5);
}
.outcome-user .outcome-visual span { top: 31px; width: 26px; height: 26px; border-radius: 50%; }
.outcome-user .outcome-visual span:nth-child(1) { left: 8%; }
.outcome-user .outcome-visual span:nth-child(2) { left: calc(50% - 13px); background: var(--accent-gradient); border-color: transparent; box-shadow: 0 0 24px rgba(42,119,255,.3); }
.outcome-user .outcome-visual span:nth-child(3) { right: 8%; }

.outcome-organization .outcome-visual span { width: 44%; height: 28px; border-radius: 5px; }
.outcome-organization .outcome-visual span:nth-child(1) { left: 0; top: 12px; }
.outcome-organization .outcome-visual span:nth-child(2) { right: 0; top: 12px; }
.outcome-organization .outcome-visual span:nth-child(3) { left: 28%; top: 48px; background: linear-gradient(135deg, rgba(42,119,255,.26), rgba(42,119,255,.06)); }

.outcome-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 0;
  color: var(--text-dim);
}

.outcome-link::before {
  content: "";
  flex: 0 0 34px;
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, rgba(42,119,255,.2), var(--accent));
}

.outcome-link::after {
  content: "";
  flex: 0 0 8px;
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--accent-hover);
  border-right: 2px solid var(--accent-hover);
  transform: rotate(45deg);
}

.outcome-link span {
  position: absolute;
  width: 72px;
  margin-top: 70px;
  text-align: center;
  font-size: .68rem;
  line-height: 1.45;
}

.reflection {
  display: grid;
  grid-template-columns: minmax(170px, .33fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  background: linear-gradient(115deg, rgba(18, 25, 37, .98), rgba(16, 21, 30, .86));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 4vw, 52px);
}

.reflection h3 {
  margin: 8px 0 0;
  font-size: clamp(1.5rem, 2.5vw, 2.15rem);
}

.reflection-heading span {
  color: var(--accent-hover);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
}

.reflection ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(20px, 2vw, 32px);
  row-gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: reflection;
  color: var(--text-muted);
}

.reflection li {
  position: relative;
  counter-increment: reflection;
  margin: 0;
  padding: 18px 22px 22px 54px;
  border-top: 1px solid rgba(108, 126, 156, .2);
}

.reflection li::before {
  content: "0" counter(reflection);
  position: absolute;
  left: 0;
  top: 18px;
  color: var(--accent-hover);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.reflection li:nth-child(odd) {
  border-right: 0;
}

.reflection li strong {
  color: var(--text);
}

@media (max-width: 900px) {
  .outcome-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .outcome-link {
    height: 34px;
  }

  .outcome-link::before {
    flex-basis: 1px;
    width: 1px;
    height: 24px;
    background: linear-gradient(rgba(42,119,255,.2), var(--accent));
  }

  .outcome-link::after {
    margin: -4px 0 0;
    transform: rotate(135deg);
  }

  .outcome-link span { display: none; }

  .reflection {
    grid-template-columns: 1fr;
  }

  .reflection ol {
    grid-template-columns: 1fr;
  }

  .reflection li:nth-child(odd) {
    border-right: 0;
  }
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) var(--space-md);
  background: var(--bg-elevated);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.footer-inner p {
  margin: 0.3rem 0;
}

/* ===== Back to top ===== */
.back-to-top {
  position: fixed;
  right: var(--space-md);
  bottom: var(--space-md);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), border-color var(--transition), color var(--transition);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  color: var(--accent-hover);
  border-color: var(--border-strong);
}

.back-to-top:active {
  transform: scale(0.95);
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.lightbox:not([hidden]) {
  opacity: 1;
  pointer-events: auto;
}

.lightbox img {
  max-width: 100%;
  max-height: calc(100vh - 120px);
  object-fit: contain;
  border-radius: var(--radius);
}

.lightbox-caption {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: var(--space-sm);
  text-align: center;
  max-width: 720px;
}

.lightbox-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color var(--transition), color var(--transition);
}

.lightbox-close:hover {
  color: var(--accent-hover);
  border-color: var(--border-strong);
}

/* ===== Utility ===== */
@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .section {
    padding: var(--space-xl) var(--space-sm);
  }

  .hero {
    padding: calc(var(--nav-h) + var(--space-lg)) var(--space-sm) var(--space-lg);
  }

  .evidence-num {
    font-size: 1.625rem;
  }

  .stat-num {
    font-size: 1.8rem;
  }
}

@media (max-width: 760px) {
  .experience-map,
  .evolution-flow {
    grid-template-columns: 1fr;
  }

  .experience-map-bridge {
    grid-column: 1;
    flex-wrap: wrap;
  }

  .evolution-flow > i {
    justify-self: center;
    padding: 4px 0;
    transform: rotate(90deg);
  }

  .chapter-header {
    grid-template-columns: 1fr;
  }

  .home-visual-heading {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .chapter-header p {
    grid-column: 1;
  }

  .case-chapter {
    padding: 52px 0;
  }
}