/* ===== 01 Tokens & Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-ink-900: #0B1E33;
  --color-ink-800: #132A45;
  --color-ink-700: #1A3A5C;
  --color-electric: #A846FF;
  --color-neon: #39FF14;
  --color-fog: #E6EDF3;
  --color-mist: #8A9BAA;
  --color-amber: #FFC107;
  --color-black: #000000;
  --color-white: #FFFFFF;
  --font-heading: "Arial Black", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Roboto", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Courier New", "Roboto Mono", monospace;
  --header-h: 72px;
  --rail-w: 44px;
  --content-max: 1240px;
  --content-pad: clamp(20px, 4vw, 48px);
  --radius-sm: 6px;
  --radius-md: 14px;
  --border-line: 1px solid rgba(230, 237, 243, 0.14);
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 16px rgba(57, 255, 20, 0.45);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 200ms;
  --t-base: 300ms;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-fog);
  min-height: 100vh;
  background-color: var(--color-ink-900);
  background-image:
    repeating-linear-gradient(115deg, rgba(230, 237, 243, 0.022) 0 1px, transparent 1px 24px),
    linear-gradient(180deg, var(--color-ink-900) 0%, var(--color-ink-800) 42%, var(--color-ink-900) 100%);
  background-attachment: fixed;
}

img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: none; }

::selection { background: rgba(168, 70, 255, 0.45); color: var(--color-white); }

:focus-visible { outline: 2px solid var(--color-neon); outline-offset: 3px; border-radius: 2px; }

/* ===== 02 Base & Typography ===== */
main { display: block; min-height: 62vh; padding-top: var(--header-h); }
main:focus { outline: none; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-white);
  text-wrap: balance;
}

.display-title {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 7vw, 6rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--color-white);
}

/* ===== 03 Utilities ===== */
.container {
  width: 100%;
  max-width: calc(var(--content-max) + 2 * var(--content-pad));
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

.section { padding-block: clamp(64px, 9vw, 128px); }
.section-dark { background: rgba(0, 0, 0, 0.28); border-block: var(--border-line); }

.section-head { max-width: 760px; margin-bottom: clamp(32px, 5vw, 56px); }

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-electric);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.section-kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-neon);
  box-shadow: var(--shadow-glow);
}

.section-title {
  font-size: clamp(2.2rem, 4.6vw, 4rem);
  line-height: 1.1;
  color: var(--color-white);
}

.section-desc {
  margin-top: 14px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-mist);
  max-width: 52em;
}

/* ===== 04 Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--color-neon), #22c55e);
  color: var(--color-black);
  box-shadow: 0 0 18px rgba(57, 255, 20, 0.25);
}
.btn-primary:hover { box-shadow: 0 6px 24px rgba(57, 255, 20, 0.4); }

.btn-ghost {
  background: transparent;
  border-color: rgba(230, 237, 243, 0.3);
  color: var(--color-fog);
}
.btn-ghost:hover { border-color: var(--color-electric); color: var(--color-white); box-shadow: 0 0 14px rgba(168, 70, 255, 0.25); }

.btn-sm { padding: 9px 16px; font-size: 0.78rem; }

/* ===== 05 Header & Nav ===== */
.skip-link {
  position: fixed;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  background: var(--color-neon);
  color: var(--color-black);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 12px 24px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-glow);
  transition: top var(--t-fast) var(--ease);
  white-space: nowrap;
}
.skip-link:focus-visible { top: 0; }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 220;
  background: var(--color-neon);
  box-shadow: var(--shadow-glow);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--header-h);
  background: rgba(11, 30, 51, 0.92);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: var(--border-line);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(80px, 16vw, 220px);
  height: 2px;
  background: linear-gradient(90deg, var(--color-electric), transparent);
}

.header-inner {
  height: 100%;
  max-width: calc(var(--content-max) + 2 * var(--content-pad));
  margin-inline: auto;
  padding-inline: var(--content-pad);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-logo-symbol {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-electric), var(--color-ink-700));
  border-radius: 8px;
  box-shadow: 0 0 14px rgba(168, 70, 255, 0.5);
  overflow: hidden;
}
.brand-logo-symbol::after {
  content: "";
  position: absolute;
  top: 3px;
  right: 3px;
  width: 6px;
  height: 6px;
  background: var(--color-neon);
  border-radius: 50%;
  box-shadow: var(--shadow-glow);
  animation: pulse-dot 2s var(--ease) infinite;
}

.symbol-bolt {
  width: 16px;
  height: 22px;
  background: var(--color-neon);
  clip-path: polygon(55% 0, 100% 0, 41% 100%, 65% 44%, 22% 44%);
  filter: drop-shadow(0 0 4px rgba(57, 255, 20, 0.8));
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.brand-logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand-logo-text em {
  font-style: normal;
  font-family: var(--font-data);
  font-size: 0.85em;
  color: var(--color-neon);
  margin-left: 2px;
}

.brand-tagline {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--color-mist);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-left: 1px solid rgba(230, 237, 243, 0.18);
  padding-left: 14px;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}
.site-nav a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 13px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-mist);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.site-nav a:hover { color: var(--color-white); background: rgba(168, 70, 255, 0.1); }
.site-nav a[aria-current="page"] {
  color: var(--color-neon);
  background: rgba(57, 255, 20, 0.08);
}
.site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 4px;
  height: 2px;
  background: var(--color-neon);
  border-radius: 2px;
  box-shadow: var(--shadow-glow);
}

.nav-index {
  font-family: var(--font-data);
  font-size: 0.65rem;
  color: var(--color-electric);
  opacity: 0.8;
}
.nav-label { display: inline-block; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.header-search {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 14px;
  border: var(--border-line);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--color-mist);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.header-search:hover { border-color: var(--color-electric); color: var(--color-white); }

.search-glyph {
  position: relative;
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-radius: 50%;
  flex-shrink: 0;
}
.search-glyph::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 5px;
  height: 2px;
  background: currentColor;
  transform: rotate(45deg);
  border-radius: 2px;
}
.search-label { display: inline-block; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: var(--border-line);
  border-radius: var(--radius-sm);
  background: rgba(11, 30, 51, 0.6);
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--color-electric); }

.nav-toggle-line {
  display: block;
  height: 2px;
  background: var(--color-fog);
  border-radius: 2px;
  transition: transform var(--t-base) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 06 Frame Rail ===== */
.frame-rail {
  position: fixed;
  top: var(--header-h);
  right: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 150;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  padding: 16px 0 24px;
  border-left: var(--border-line);
  background: linear-gradient(180deg, rgba(11, 30, 51, 0.55), rgba(11, 30, 51, 0.9));
  pointer-events: none;
}

.rail-axis {
  writing-mode: vertical-rl;
  font-family: var(--font-data);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--color-mist);
  text-transform: uppercase;
  margin-bottom: auto;
}

.rail-coord {
  writing-mode: vertical-rl;
  font-family: var(--font-data);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--color-electric);
}

.rail-track {
  display: block;
  position: relative;
  width: 2px;
  height: 160px;
  background: rgba(230, 237, 243, 0.12);
  border-radius: 2px;
  overflow: hidden;
}

.rail-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: linear-gradient(180deg, var(--color-neon), var(--color-electric));
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.6);
  transition: height 0.15s linear;
}

.rail-chapter {
  writing-mode: vertical-rl;
  font-family: var(--font-heading);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-mist);
  text-transform: uppercase;
  max-height: 100px;
  overflow: hidden;
}

/* ===== 07 Footer ===== */
.site-footer {
  position: relative;
  background: var(--color-black);
  border-top: 1px solid rgba(168, 70, 255, 0.35);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: clamp(80px, 18vw, 260px);
  height: 2px;
  background: linear-gradient(90deg, var(--color-neon), transparent);
  box-shadow: var(--shadow-glow);
}

.footer-frame {
  padding-block: clamp(48px, 7vw, 84px) 0;
  background: linear-gradient(135deg, rgba(168, 70, 255, 0.06), transparent 60%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(40px, 6vw, 64px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}
.site-footer .brand-logo-text { font-size: 1.15rem; }
.site-footer .brand-logo-symbol { width: 34px; height: 34px; }

.footer-tagline {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--color-electric);
  text-transform: uppercase;
}

.footer-trust {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color-mist);
  max-width: 34em;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-heading {
  font-family: var(--font-data);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-mist);
  text-transform: uppercase;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(230, 237, 243, 0.12);
}

.footer-col a {
  position: relative;
  padding: 7px 0;
  font-size: 0.875rem;
  color: var(--color-fog);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.footer-col a:hover { color: var(--color-neon); padding-left: 10px; }
.footer-col a::before {
  content: "/";
  position: absolute;
  left: 0;
  color: var(--color-electric);
  opacity: 0;
  transition: opacity var(--t-fast) var(--ease);
}
.footer-col a:hover::before { opacity: 1; }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-line {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  background: rgba(230, 237, 243, 0.04);
  border-radius: var(--radius-sm);
  border-left: 2px solid rgba(168, 70, 255, 0.6);
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-fog);
  word-break: break-all;
}
.contact-key {
  font-family: var(--font-body);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--color-mist);
  text-transform: uppercase;
}

.footer-bottom {
  border-top: var(--border-line);
  background: rgba(0, 0, 0, 0.35);
}

.footer-bottom-inner {
  max-width: calc(var(--content-max) + 2 * var(--content-pad));
  margin-inline: auto;
  padding: 18px var(--content-pad);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-mist);
}

.footer-copyright { color: var(--color-mist); }

.footer-icp {
  padding: 4px 10px;
  border: 1px solid rgba(230, 237, 243, 0.14);
  border-radius: 999px;
  font-size: 0.7rem;
}

/* ===== 08 Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  margin-bottom: 28px;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-mist);
  text-transform: uppercase;
}
.breadcrumb a { color: var(--color-mist); transition: color var(--t-fast) var(--ease); }
.breadcrumb a:hover { color: var(--color-neon); }
.breadcrumb .sep { color: var(--color-electric); }
.breadcrumb [aria-current="page"] { color: var(--color-fog); }

/* ===== 09 Cards & Grids ===== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(20px, 3vw, 32px);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.card {
  position: relative;
  background: rgba(19, 42, 69, 0.55);
  border: var(--border-line);
  border-radius: var(--radius-md);
  padding: clamp(24px, 3.5vw, 36px);
  overflow: hidden;
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-electric), var(--color-neon));
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(168, 70, 255, 0.45);
  box-shadow: var(--shadow-soft);
}
.card:hover::after { opacity: 1; }

.card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-white);
  margin-bottom: 10px;
}
.card-text { font-size: 0.9rem; color: var(--color-mist); line-height: 1.7; }

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-electric);
  transition: color var(--t-fast) var(--ease);
}
.card-link::after { content: "→"; transition: transform var(--t-fast) var(--ease); }
.card-link:hover { color: var(--color-neon); }
.card-link:hover::after { transform: translateX(5px); }

/* ===== 10 Chapter & Stats ===== */
.chapter-num {
  display: block;
  font-family: var(--font-data);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(168, 70, 255, 0.55);
  margin-bottom: 12px;
}

.chapter-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-data);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--color-mist);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.chapter-tag::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-neon);
  border-radius: 50%;
  box-shadow: var(--shadow-glow);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(14px, 2vw, 24px);
}

.stat-card {
  position: relative;
  background: rgba(11, 30, 51, 0.7);
  border: var(--border-line);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  overflow: hidden;
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(225deg, rgba(57, 255, 20, 0.16), transparent 70%);
}

.stat-value {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-neon);
  text-shadow: 0 0 18px rgba(57, 255, 20, 0.35);
}

.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--color-mist);
  text-transform: uppercase;
}

/* ===== 11 Legend & Route ===== */
.legend-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 20px;
  border: var(--border-line);
  border-radius: var(--radius-md);
  background: rgba(11, 30, 51, 0.6);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-mist);
  text-transform: uppercase;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}
.legend-dot.purple { background: var(--color-electric); color: var(--color-electric); }
.legend-dot.green { background: var(--color-neon); color: var(--color-neon); }
.legend-dot.gray { background: var(--color-mist); color: var(--color-mist); }
.legend-dot.amber { background: var(--color-amber); color: var(--color-amber); }

.route-strip {
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding: 4px 2px 14px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.route-node {
  flex: 0 0 164px;
  scroll-snap-align: start;
  padding: 14px 18px;
  border-left: 2px solid rgba(168, 70, 255, 0.35);
  background: rgba(11, 30, 51, 0.4);
  position: relative;
}
.route-node:first-child { border-left-color: var(--color-electric); }
.route-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-electric);
  box-shadow: 0 0 8px rgba(168, 70, 255, 0.65);
}
.route-node.is-live {
  border-left-color: rgba(57, 255, 20, 0.6);
  background: rgba(57, 255, 20, 0.04);
}
.route-node.is-live::before {
  background: var(--color-neon);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.7);
}

.route-time {
  display: block;
  font-family: var(--font-data);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-white);
}

.route-name {
  display: block;
  margin-top: 4px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--color-mist);
}

/* ===== 12 Photo Frames ===== */
.photo-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  border-radius: var(--radius-md);
  border: var(--border-line);
  overflow: hidden;
  background-image:
    repeating-linear-gradient(115deg, rgba(168, 70, 255, 0.08) 0 1px, transparent 1px 18px),
    linear-gradient(135deg, var(--color-ink-700), var(--color-black));
}
.photo-frame::before {
  content: attr(data-caption);
  position: relative;
  z-index: 1;
  padding: 10px 14px;
  font-family: var(--font-data);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(230, 237, 243, 0.35);
}
.aspect-16-9 { aspect-ratio: 16 / 9; min-height: 0; }
.aspect-4-3 { aspect-ratio: 4 / 3; min-height: 0; }

/* ===== 13 Accordion & Table ===== */
.accordion {
  border: var(--border-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(19, 42, 69, 0.4);
}
.accordion-item + .accordion-item { border-top: var(--border-line); }

.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--color-fog);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.accordion-trigger:hover { background: rgba(168, 70, 255, 0.08); color: var(--color-white); }
.accordion-trigger[aria-expanded="true"] { color: var(--color-neon); }

.accordion-trigger::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 1.1rem;
  color: var(--color-electric);
  transition: transform var(--t-base) var(--ease);
}
.accordion-trigger[aria-expanded="true"]::after { transform: rotate(45deg); }

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  padding: 0 22px;
  transition: max-height 0.32s var(--ease), padding 0.32s var(--ease);
}
.accordion-trigger[aria-expanded="true"] + .accordion-panel {
  max-height: 60vh;
  padding: 0 22px 20px;
}
.accordion-panel p { margin-bottom: 1em; }
.accordion-panel p:last-child { margin-bottom: 0; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: 0.85rem;
}
.data-table th {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 2px solid rgba(168, 70, 255, 0.4);
  color: var(--color-mist);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.data-table td {
  padding: 12px 14px;
  border-bottom: var(--border-line);
  color: var(--color-fog);
}
.data-table tr:hover td { background: rgba(168, 70, 255, 0.06); color: var(--color-white); }
.data-table .num { color: var(--color-neon); font-weight: 700; }

/* ===== 14 Prose ===== */
.prose {
  max-width: 52em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-fog);
}
.prose p { margin-bottom: 1.4em; }
.prose h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: var(--color-white);
  margin: 2.4em 0 0.8em;
}
.prose h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--color-white);
  margin: 2em 0 0.6em;
}
.prose ul { margin-bottom: 1.4em; }
.prose ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 0.6em;
}
.prose ul li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--color-neon);
}
.prose code {
  font-family: var(--font-data);
  font-size: 0.85em;
  color: var(--color-neon);
  background: rgba(57, 255, 20, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ===== 15 Responsive ===== */
@media (max-width: 1279px) {
  .frame-rail { display: none; }
}

@media (max-width: 1200px) {
  .brand-tagline { display: none; }
  .site-nav a { padding: 10px 9px; }
  .header-search .search-label { display: none; }
}

@media (max-width: 1024px) {
  .site-header { --header-h: 64px; height: var(--header-h); }
  .brand-logo-symbol { width: 32px; height: 32px; border-radius: 6px; }
  .brand-logo-text { font-size: 1.05rem; }
  .nav-toggle { display: flex; }
  .header-actions { gap: 8px; }
  .header-search { padding: 8px 10px; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 199;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 10px 16px 16px;
    background: rgba(11, 30, 51, 0.97);
    border-bottom: var(--border-line);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.3);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease), visibility var(--t-base);
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .site-nav a {
    padding: 14px 12px;
    border-bottom: 1px solid rgba(230, 237, 243, 0.08);
    border-radius: 0;
    font-size: 0.95rem;
  }
  .site-nav a:last-child { border-bottom: none; }
}

@media (max-width: 992px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 520px) {
  .stat-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .header-search { display: none; }
}

/* ===== 16 Reveal & Reduced Motion ===== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
html.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  html.js [data-reveal] { opacity: 1; transform: none; transition: none; }
}