:root {
  --bg-dark: #0a0a0d;
  --bg-dark-elevated: #121318;
  --bg-dark-card: #16181f;
  --bg-light: #f6f4ef;
  --bg-light-card: #ffffff;
  --bg-light-subtle: #ede9e0;
  --text-on-dark: #f4f2ed;
  --text-on-dark-muted: #9e9b93;
  --text-on-light: #141417;
  --text-on-light-muted: #5a5852;
  --accent-gold: #c6a365;
  --accent-gold-light: #dfd3ba;
  --accent-gold-dark: #9c7a3e;
  --accent-emerald: #1f7a58;
  --accent-amber: #b87324;
  --accent-crimson: #a63a3a;
  --border-dark: rgba(244, 242, 237, 0.12);
  --border-dark-strong: rgba(198, 163, 101, 0.38);
  --border-light: rgba(20, 20, 23, 0.11);
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Didot", "Bodoni MT", "Georgia", "Times New Roman", "Songti SC", serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Menlo", "Monaco", "Consolas", monospace;
  --max-w: 1220px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-light);
  color: var(--text-on-light);
  line-height: 1.65;
  overflow-x: hidden;
}

/* Language Toggle Display Rules */
body[data-lang="zh"] .lang-en {
  display: none !important;
}

body[data-lang="en"] .lang-zh {
  display: none !important;
}

/* Top Navigation Bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 13, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-dark);
  color: var(--text-on-dark);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-mark {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-on-dark);
}

.brand-logo {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-on-dark);
}

.brand-logo span {
  color: var(--accent-gold);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-gold);
  border: 1px solid var(--border-dark-strong);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-on-dark-muted);
  text-decoration: none;
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent-gold);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn-lang,
.btn-brief {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  padding: 0.42rem 0.78rem;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-lang {
  background: transparent;
  color: var(--text-on-dark);
  border: 1px solid var(--border-dark);
}

.btn-lang:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.btn-brief {
  background: var(--accent-gold);
  color: #0a0a0d;
  border: 1px solid var(--accent-gold);
  font-weight: 600;
}

.btn-brief:hover {
  background: #d5b477;
}

/* Hero Section */
.hero {
  background: radial-gradient(circle at 82% 18%, rgba(198, 163, 101, 0.14), transparent 45%),
              linear-gradient(180deg, #0a0a0d 0%, #111217 100%);
  color: var(--text-on-dark);
  padding: 4.5rem 1.5rem 4rem;
  border-bottom: 1px solid var(--border-dark);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 1.4rem;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-gold);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-gold);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 3rem;
  align-items: start;
}

.hero-title {
  font-size: clamp(2rem, 3.6vw, 3.15rem);
  line-height: 1.18;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 1.35rem;
}

.hero-title em {
  font-family: var(--font-serif);
  font-style: normal;
  color: var(--accent-gold);
  font-weight: 400;
}

.hero-lead {
  font-size: 1.06rem;
  color: var(--text-on-dark-muted);
  max-width: 680px;
  margin-bottom: 2rem;
  line-height: 1.75;
}

.hero-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
  margin-bottom: 2rem;
}

.mini-pillar {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-dark);
  padding: 0.95rem 1rem;
  border-radius: 4px;
}

.mini-pillar-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-gold);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.3rem;
}

.mini-pillar-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-on-dark);
  margin-bottom: 0.25rem;
}

.mini-pillar-desc {
  font-size: 0.78rem;
  color: var(--text-on-dark-muted);
  line-height: 1.45;
}

/* Executive Briefing Right Card */
.hero-dossier {
  background: var(--bg-dark-card);
  border: 1px solid var(--border-dark-strong);
  border-radius: 6px;
  padding: 1.6rem;
  position: relative;
}

.dossier-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--border-dark);
}

.dossier-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-gold);
}

.dossier-status {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: #5ce0a8;
  background: rgba(31, 122, 88, 0.22);
  border: 1px solid rgba(92, 224, 168, 0.3);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
}

.dossier-profile {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.dossier-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 1.5px solid var(--accent-gold);
  background: #fff;
  flex-shrink: 0;
}

.dossier-name {
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--text-on-dark);
}

.dossier-role {
  font-size: 0.82rem;
  color: var(--accent-gold);
  margin-top: 0.15rem;
}

.dossier-creds {
  font-size: 0.78rem;
  color: var(--text-on-dark-muted);
  margin-top: 0.2rem;
}

.dossier-Focus-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-on-dark-muted);
  margin-bottom: 0.55rem;
}

.lens-switcher {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1.2rem;
}

.lens-btn {
  text-align: left;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-dark);
  color: var(--text-on-dark-muted);
  padding: 0.6rem 0.8rem;
  border-radius: 4px;
  font-size: 0.82rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.lens-btn:hover {
  border-color: rgba(198, 163, 101, 0.5);
  color: var(--text-on-dark);
}

.lens-btn.active {
  background: rgba(198, 163, 101, 0.12);
  border-color: var(--accent-gold);
  color: var(--text-on-dark);
  font-weight: 600;
}

.lens-btn .lens-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--accent-gold);
}

.dossier-callout {
  background: rgba(10, 10, 13, 0.65);
  border-left: 2px solid var(--accent-gold);
  padding: 0.75rem 0.9rem;
  font-size: 0.81rem;
  color: var(--text-on-dark-muted);
  line-height: 1.55;
}

/* Section Common */
.section {
  padding: 4.5rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.section-dark {
  background: var(--bg-dark);
  color: var(--text-on-dark);
  border-bottom: 1px solid var(--border-dark);
}

.section-subtle {
  background: var(--bg-light-subtle);
}

.section-header {
  max-width: 820px;
  margin-bottom: 2.8rem;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-gold-dark);
  margin-bottom: 0.6rem;
  display: block;
}

.section-dark .section-kicker {
  color: var(--accent-gold);
}

.section-title {
  font-size: clamp(1.6rem, 2.6vw, 2.25rem);
  line-height: 1.25;
  font-weight: 600;
  margin-bottom: 0.85rem;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 0.98rem;
  color: var(--text-on-light-muted);
  line-height: 1.7;
}

.section-dark .section-desc {
  color: var(--text-on-dark-muted);
}

/* Section 1: The China Walled-Garden Dilemma */
.dilemma-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.2rem;
}

.dilemma-card {
  background: var(--bg-light-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.025);
}

.dilemma-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-gold-dark);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.dilemma-quote {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-on-light);
  margin-bottom: 0.85rem;
  line-height: 1.4;
}

.dilemma-body {
  font-size: 0.88rem;
  color: var(--text-on-light-muted);
  margin-bottom: 1.2rem;
  line-height: 1.65;
}

.dilemma-vs {
  border-top: 1px dashed var(--border-light);
  padding-top: 0.9rem;
  font-size: 0.8rem;
}

.vs-bad {
  color: var(--accent-crimson);
  margin-bottom: 0.35rem;
  display: block;
}

.vs-good {
  color: var(--accent-emerald);
  font-weight: 600;
  display: block;
}

/* FDE Architecture Flow */
.arch-banner {
  background: #14151b;
  color: var(--text-on-dark);
  border: 1px solid var(--border-dark-strong);
  border-radius: 6px;
  padding: 1.8rem 2rem;
}

.arch-banner-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 1.2rem;
}

.arch-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.arch-step {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-dark);
  padding: 1.1rem;
  border-radius: 4px;
  position: relative;
}

.arch-step-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-gold);
  margin-bottom: 0.4rem;
  display: block;
}

.arch-step h4 {
  font-size: 0.92rem;
  margin-bottom: 0.4rem;
  color: var(--text-on-dark);
}

.arch-step p {
  font-size: 0.78rem;
  color: var(--text-on-dark-muted);
  line-height: 1.5;
}

/* Interactive Sandbox Section */
.sector-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.15rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-dark);
  padding: 0.75rem 1.15rem;
  border-radius: 6px;
}

.sector-bar-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sector-buttons {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.sector-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-dark);
  color: var(--text-on-dark-muted);
  padding: 0.48rem 0.95rem;
  border-radius: 4px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sector-btn:hover {
  border-color: rgba(198, 163, 101, 0.5);
  color: var(--text-on-dark);
}

.sector-btn.active {
  background: var(--accent-gold);
  border-color: var(--accent-gold);
  color: #0a0a0d;
  font-weight: 600;
}

.sandbox-wrapper {
  background: var(--bg-dark-elevated);
  border: 1px solid var(--border-dark-strong);
  border-radius: 8px;
  overflow: hidden;
}

.sandbox-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-dark);
  background: #0d0e12;
  overflow-x: auto;
}

.sandbox-tab {
  flex: 1;
  min-width: 220px;
  padding: 1.05rem 1.25rem;
  background: transparent;
  border: none;
  border-right: 1px solid var(--border-dark);
  color: var(--text-on-dark-muted);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sandbox-tab:hover {
  color: var(--text-on-dark);
  background: rgba(255, 255, 255, 0.02);
}

.sandbox-tab.active {
  background: var(--bg-dark-elevated);
  color: var(--accent-gold);
  box-shadow: inset 0 2px 0 var(--accent-gold);
  font-weight: 600;
}

.sandbox-tab-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  display: block;
  margin-bottom: 0.2rem;
  opacity: 0.8;
}

.sandbox-panel {
  display: none;
  padding: 2rem;
}

.sandbox-panel.active {
  display: block;
}

.sandbox-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-dark);
}

.sandbox-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-on-dark-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.3rem 0.65rem;
  border-radius: 3px;
}

/* Audit Table & Detail Split */
.audit-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.5rem;
  align-items: start;
}

.audit-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}

.audit-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.69rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-on-dark-muted);
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-dark);
}

.audit-table td {
  padding: 0.85rem 0.75rem;
  border-bottom: 1px solid var(--border-dark);
  color: var(--text-on-dark);
}

.audit-row {
  cursor: pointer;
  transition: background 0.15s ease;
}

.audit-row:hover {
  background: rgba(198, 163, 101, 0.08);
}

.audit-row.selected {
  background: rgba(198, 163, 101, 0.15);
}

.badge-verdict {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.18rem 0.5rem;
  border-radius: 2px;
  font-weight: 600;
  display: inline-block;
}

.verdict-scale {
  background: rgba(31, 122, 88, 0.25);
  color: #63e2b1;
  border: 1px solid rgba(99, 226, 177, 0.35);
}

.verdict-optimize {
  background: rgba(184, 115, 36, 0.25);
  color: #f5b963;
  border: 1px solid rgba(245, 185, 99, 0.35);
}

.verdict-cut {
  background: rgba(166, 58, 58, 0.25);
  color: #f28b8b;
  border: 1px solid rgba(242, 139, 139, 0.35);
}

.audit-detail-card {
  background: #101116;
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  padding: 1.35rem;
}

.detail-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-gold);
  margin-bottom: 0.35rem;
}

.detail-sub {
  font-size: 0.78rem;
  color: var(--text-on-dark-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-dark);
}

.metric-bars {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
}

.metric-bar-row {
  font-size: 0.78rem;
}

.metric-bar-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.25rem;
  color: var(--text-on-dark-muted);
}

.metric-bar-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  background: var(--accent-gold);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.detail-diagnosis {
  font-size: 0.82rem;
  color: var(--text-on-dark);
  background: rgba(255, 255, 255, 0.03);
  padding: 0.85rem;
  border-radius: 4px;
  border-left: 2px solid var(--accent-gold);
  line-height: 1.6;
}

/* Next-Wave Playbook Grid */
.nextwave-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.nw-card {
  background: #101116;
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  padding: 1.35rem;
}

.nw-card-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  display: block;
}

.nw-card h4 {
  font-size: 0.98rem;
  color: var(--text-on-dark);
  margin-bottom: 0.65rem;
}

.nw-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  font-size: 0.82rem;
  color: var(--text-on-dark-muted);
}

.nw-list li {
  padding-left: 0.9rem;
  position: relative;
  line-height: 1.5;
}

.nw-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--accent-gold);
  font-weight: bold;
}

/* Walled Garden Data Fusion Grid */
.fusion-grid {
  display: grid;
  grid-template-columns: 1fr 0.2fr 1.1fr;
  gap: 1rem;
  align-items: center;
}

.fusion-col {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.fusion-box {
  background: #101116;
  border: 1px solid var(--border-dark);
  padding: 1rem 1.15rem;
  border-radius: 5px;
}

.fusion-box h5 {
  font-size: 0.88rem;
  color: var(--text-on-dark);
  margin-bottom: 0.3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.fusion-box p {
  font-size: 0.78rem;
  color: var(--text-on-dark-muted);
  line-height: 1.5;
}

.fusion-arrow {
  text-align: center;
  font-family: var(--font-mono);
  color: var(--accent-gold);
  font-size: 0.8rem;
}

/* Proven Systems & Track Record */
.systems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem;
}

.system-card {
  background: var(--bg-light-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.85rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.system-card-top {
  margin-bottom: 1.2rem;
}

.system-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.system-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent-gold-dark);
  font-weight: 600;
}

.system-scope-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: var(--bg-light-subtle);
  color: var(--text-on-light-muted);
  padding: 0.18rem 0.55rem;
  border-radius: 3px;
}

.system-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
  color: var(--text-on-light);
}

.system-desc {
  font-size: 0.9rem;
  color: var(--text-on-light-muted);
  margin-bottom: 1rem;
  line-height: 1.65;
}

.system-mechanisms {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1.2rem;
}

.system-mechanisms li {
  font-size: 0.84rem;
  color: var(--text-on-light);
  padding-left: 1rem;
  position: relative;
}

.system-mechanisms li::before {
  content: "■";
  font-size: 0.5rem;
  color: var(--accent-gold-dark);
  position: absolute;
  left: 0;
  top: 0.35rem;
}

.system-evidence {
  background: var(--bg-light);
  border-top: 1px solid var(--border-light);
  padding: 0.8rem 1rem;
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--text-on-light-muted);
}

/* Enterprise Cases Matrix */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.35rem;
}

.case-card {
  background: var(--bg-light-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1.5rem;
}

.case-sector {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-gold-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
  display: block;
}

.case-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.case-body {
  font-size: 0.85rem;
  color: var(--text-on-light-muted);
  line-height: 1.6;
  margin-bottom: 0.9rem;
}

.case-boundary {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-on-light-muted);
  border-top: 1px dashed var(--border-light);
  padding-top: 0.65rem;
}

/* Principal & Career Trajectory */
.principal-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.principal-card {
  background: var(--bg-light-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 2rem;
}

.principal-top {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.4rem;
}

.principal-photo {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-gold-dark);
}

.principal-bio {
  font-size: 0.9rem;
  color: var(--text-on-light-muted);
  line-height: 1.7;
  margin-bottom: 1.4rem;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.timeline-item {
  background: var(--bg-light-card);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--accent-gold-dark);
  border-radius: 4px;
  padding: 1.15rem 1.35rem;
}

.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.35rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-org {
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-on-light);
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-gold-dark);
}

.timeline-desc {
  font-size: 0.85rem;
  color: var(--text-on-light-muted);
  line-height: 1.55;
}

/* FDE Engagement Pilot Section */
.pilot-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.pilot-card {
  background: var(--bg-dark-card);
  border: 1px solid var(--border-dark);
  border-radius: 6px;
  padding: 1.75rem;
}

.pilot-phase {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-gold);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.5rem;
}

.pilot-card h3 {
  font-size: 1.1rem;
  color: var(--text-on-dark);
  margin-bottom: 0.65rem;
}

.pilot-card p {
  font-size: 0.85rem;
  color: var(--text-on-dark-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.pilot-deliverable {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-gold-light);
  border-top: 1px solid var(--border-dark);
  padding-top: 0.75rem;
}

.share-box {
  background: linear-gradient(135deg, #161821 0%, #101116 100%);
  border: 1px solid var(--border-dark-strong);
  border-radius: 6px;
  padding: 1.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.share-text h4 {
  font-size: 1.05rem;
  color: var(--text-on-dark);
  margin-bottom: 0.35rem;
}

.share-text p {
  font-size: 0.84rem;
  color: var(--text-on-dark-muted);
}

.share-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-outline-gold {
  background: transparent;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
  padding: 0.6rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-outline-gold:hover {
  background: rgba(198, 163, 101, 0.12);
}

.btn-solid-gold {
  background: var(--accent-gold);
  color: #0a0a0d;
  border: 1px solid var(--accent-gold);
  padding: 0.6rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-solid-gold:hover {
  background: #d6b578;
}

.site-footer {
  background: #070709;
  color: var(--text-on-dark-muted);
  padding: 2.2rem 1.5rem;
  font-size: 0.78rem;
  border-top: 1px solid var(--border-dark);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Mobile Quick Nav & Hero Stats Grid */
.mobile-quick-nav {
  display: none;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

.hero-stat-box {
  background: rgba(198, 163, 101, 0.08);
  border: 1px solid var(--border-dark-strong);
  border-radius: 6px;
  padding: 0.85rem 1rem;
}

.hero-stat-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-gold);
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.hero-stat-label {
  font-size: 0.76rem;
  color: var(--text-on-dark-muted);
  line-height: 1.35;
}

/* Responsive & Mobile-First Experience */
.hero-grid > *,
.audit-layout > *,
.principal-grid > *,
.fusion-grid > *,
.dilemma-grid > *,
.nextwave-grid > *,
.systems-grid > *,
.cases-grid > *,
.pilot-steps > *,
.arch-steps > *,
.hero-stats-grid > * {
  min-width: 0;
}

.audit-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 980px) {
  .mobile-quick-nav {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 1rem;
    background: rgba(14, 15, 20, 0.96);
    border-top: 1px solid var(--border-dark);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .mobile-quick-nav::-webkit-scrollbar {
    display: none;
  }
  .m-nav-pill {
    flex-shrink: 0;
    font-size: 0.75rem;
    color: var(--text-on-dark-muted);
    text-decoration: none;
    padding: 0.34rem 0.72rem;
    border: 1px solid var(--border-dark);
    border-radius: 99px;
    background: rgba(255, 255, 255, 0.03);
    white-space: nowrap;
  }
  .m-nav-pill:active,
  .m-nav-pill:hover {
    color: #0a0a0d;
    background: var(--accent-gold);
    border-color: var(--accent-gold);
  }
  .hero-grid,
  .audit-layout,
  .principal-grid,
  .fusion-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.65rem;
  }
  .dilemma-grid,
  .nextwave-grid,
  .systems-grid,
  .cases-grid,
  .pilot-steps,
  .arch-steps,
  .hero-pillars {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .nav-links {
    display: none;
  }
  .fusion-arrow {
    transform: rotate(90deg);
    margin: 0.2rem 0;
  }
}

@media (max-width: 768px) {
  .sector-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.55rem;
    padding: 0.85rem;
  }
  .sector-buttons {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }
  .sector-btn {
    width: 100%;
    text-align: left;
    padding: 0.62rem 0.85rem;
    font-size: 0.83rem;
  }
  .sandbox-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    overflow-x: visible;
  }
  .sandbox-tab {
    min-width: 0;
    padding: 0.7rem 0.5rem;
    font-size: 0.76rem;
    text-align: center;
  }
  .sandbox-tab-num {
    font-size: 0.6rem;
    margin-bottom: 0.15rem;
  }

  /* Transform Audit Table into Native Mobile Cards */
  .audit-table,
  .audit-table tbody {
    display: block;
    width: 100%;
  }
  .audit-table thead {
    display: none;
  }
  .audit-table tr.audit-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 0.75rem;
    background: #101117;
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 0.9rem;
    margin-bottom: 0.75rem;
  }
  .audit-table tr.audit-row.selected {
    background: rgba(198, 163, 101, 0.14);
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 1px var(--accent-gold);
  }
  .audit-table td {
    display: flex;
    flex-direction: column;
    padding: 0;
    border: none;
    font-size: 0.84rem;
  }
  .audit-table td.td-flight-name {
    grid-column: 1 / -1;
    padding-bottom: 0.5rem;
    margin-bottom: 0.15rem;
    border-bottom: 1px solid var(--border-dark);
    font-size: 0.9rem;
    line-height: 1.4;
  }
  body[data-lang="zh"] .audit-table td[data-label-zh]::before {
    content: attr(data-label-zh);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    color: var(--text-on-dark-muted);
    margin-bottom: 0.12rem;
  }
  body[data-lang="en"] .audit-table td[data-label-en]::before {
    content: attr(data-label-en);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    color: var(--text-on-dark-muted);
    margin-bottom: 0.12rem;
  }
}

@media (max-width: 640px) {
  .nav-container {
    padding: 0.65rem 0.95rem;
    gap: 0.5rem;
  }
  .brand-tag {
    display: none;
  }
  .btn-lang,
  .btn-brief {
    font-size: 0.72rem;
    padding: 0.38rem 0.65rem;
  }
  .hero {
    padding: 1.9rem 1rem 2.2rem;
  }
  .hero-eyebrow {
    font-size: 0.66rem;
    letter-spacing: 0.06em;
    margin-bottom: 0.9rem;
  }
  .hero-title {
    font-size: 1.65rem;
    line-height: 1.26;
    margin-bottom: 0.95rem;
  }
  .hero-lead {
    font-size: 0.92rem;
    line-height: 1.65;
    margin-bottom: 1.25rem;
  }
  .hero-stat-box {
    padding: 0.75rem 0.8rem;
  }
  .hero-stat-num {
    font-size: 1.12rem;
  }
  .hero-dossier,
  .dilemma-card,
  .system-card,
  .case-card,
  .principal-card,
  .pilot-card,
  .arch-banner,
  .share-box,
  .sandbox-panel {
    padding: 1.15rem;
  }
  .dossier-header {
    flex-wrap: wrap;
    gap: 0.35rem;
  }
  .lens-btn {
    padding: 0.7rem 0.85rem;
    font-size: 0.84rem;
  }
  .section {
    padding: 2.4rem 1rem;
  }
  .section-header {
    margin-bottom: 1.6rem;
  }
  .section-title {
    font-size: 1.42rem;
  }
  .section-desc {
    font-size: 0.9rem;
  }
  .principal-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
  .share-buttons {
    width: 100%;
  }
  .share-buttons button {
    flex: 1;
    text-align: center;
  }
}

.mobile-float-bar {
  display: none;
}

@media (max-width: 768px) {
  html,
  body {
    max-width: 100%;
    overflow-x: hidden;
  }
  .site-footer {
    padding-bottom: 4.8rem;
  }
  .mobile-float-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.35rem;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 120;
    background: rgba(10, 10, 13, 0.95);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--border-dark-strong);
    padding: 0.5rem 0.65rem calc(0.5rem + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -6px 24px rgba(0, 0, 0, 0.45);
  }
  .mf-link,
  .mf-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 0.76rem;
    font-weight: 500;
    padding: 0.48rem 0.25rem;
    border-radius: 4px;
    text-align: center;
    white-space: nowrap;
  }
  .mf-link {
    color: var(--text-on-dark);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-dark);
  }
  .mf-btn {
    color: #0a0a0d;
    background: var(--accent-gold);
    border: 1px solid var(--accent-gold);
    font-weight: 600;
    cursor: pointer;
  }
}

@media print {
  .site-header,
  .sandbox-tabs,
  .share-buttons,
  .mobile-float-bar {
    display: none !important;
  }
  .section,
  .hero {
    padding: 1.5rem 0;
  }
}