/* ==== Reset ==== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { background: var(--ink-black); scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { min-height: 100vh; font-family: var(--font-body); font-size: 16px; line-height: 1.75; color: var(--ink-brown); background: var(--ink-black); -webkit-font-smoothing: antialiased; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
address { font-style: normal; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-display); line-height: 1.2; font-weight: 900; color: var(--ink-black); }
::selection { background: var(--neon-green); color: var(--ink-black); }

/* ==== Tokens ==== */
:root {
  --ink-black: #16110E;
  --paper-cream: #F2EBDD;
  --cream-deep: #E3D6C3;
  --neon-green: #39FF14;
  --electric-purple: #8A2BE2;
  --signal-orange: #FF4D00;
  --data-blue: #00C8FF;
  --ink-brown: #3B2C26;
  --muted-gray: #A89F94;
  --soft-white: #FFFDF7;
  --font-display: "Orbitron", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --space-xs: 4px; --space-sm: 8px; --space-md: 16px; --space-lg: 28px; --space-xl: 48px;
  --header-h: 76px;
  --border-dark: rgba(242, 235, 221, 0.1);
}

/* ==== Base typography ==== */
#main-content { display: block; background: var(--paper-cream); color: var(--ink-brown); min-height: 65vh; }
#main-content a:not([class]) { color: var(--electric-purple); text-decoration: underline; text-decoration-color: rgba(138, 43, 226, 0.35); text-underline-offset: 3px; transition: color 0.2s ease; }
#main-content a:not([class]):hover { color: var(--signal-orange); }
.mono { font-family: var(--font-mono); }
.font-display { font-family: var(--font-display); }
.text-muted { color: var(--muted-gray); }
.text-accent { color: var(--electric-purple); }
.text-warn { color: var(--signal-orange); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* ==== Focus visible ==== */
:focus-visible { outline: 2px solid var(--neon-green); outline-offset: 2px; }

/* ==== Skip link ==== */
.skip-link { position: fixed; top: -200px; left: 12px; z-index: 500; padding: 14px 20px; background: var(--neon-green); color: var(--ink-black); font-weight: 700; font-size: 14px; border: 2px solid var(--soft-white); transition: top 0.2s ease; }
.skip-link:focus { top: 12px; }

/* ==== Scroll progress ==== */
.scroll-progress { position: fixed; top: 0; left: 0; width: 0; height: 3px; z-index: 400; background: linear-gradient(90deg, var(--neon-green), var(--data-blue), var(--electric-purple)); box-shadow: 0 0 10px rgba(57, 255, 20, 0.5); }

/* ==== Header ==== */
.site-header { position: sticky; top: 0; z-index: 200; background: var(--ink-black); border-bottom: 1px solid var(--border-dark); }
.header-frame { max-width: 1440px; margin: 0 auto; min-height: var(--header-h); display: flex; align-items: center; gap: clamp(8px, 2vw, 24px); padding: 12px clamp(16px, 3vw, 40px); }
.header-brand { flex: none; min-width: 0; display: flex; flex-direction: column; justify-content: center; gap: 2px; }
.brand-link { display: inline-flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark { position: relative; display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; flex: none; background: var(--ink-black); border: 1px solid var(--neon-green); color: var(--neon-green); font-family: var(--font-display); font-size: 14px; font-weight: 700; letter-spacing: 0.06em; overflow: hidden; }
.brand-mark-scan { position: absolute; left: 0; right: 0; top: -60%; height: 55%; background: linear-gradient(180deg, transparent, rgba(57, 255, 20, 0.35), transparent); animation: brandScan 4.5s ease-in-out infinite; }
.brand-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.25; }
.brand-name { font-family: var(--font-display); font-size: 15px; font-weight: 700; letter-spacing: 0.03em; color: var(--soft-white); white-space: nowrap; }
.brand-sub { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--neon-green); }
.header-tagline { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--muted-gray); white-space: nowrap; }

/* ==== Header nav ==== */
.header-nav { flex: 1; display: flex; justify-content: center; min-width: 0; }
.nav-title { display: none; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-item { position: relative; }
.nav-link { position: relative; display: flex; align-items: center; gap: 8px; padding: 10px 9px; color: rgba(242, 235, 221, 0.85); font-size: 14px; letter-spacing: 0.03em; transition: color 0.2s ease; }
.nav-link::after { content: ""; position: absolute; left: 8px; right: 8px; bottom: 3px; height: 2px; background: var(--electric-purple); transform: scaleX(0); transform-origin: left; transition: transform 0.28s ease; }
.nav-link:hover { color: var(--neon-green); }
.nav-link:hover::after, .nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--neon-green); }
.nav-index { font-family: var(--font-mono); font-size: 11px; opacity: 0.55; transition: opacity 0.2s ease, color 0.2s ease; }
.nav-link:hover .nav-index, .nav-link[aria-current="page"] .nav-index { opacity: 1; color: var(--signal-orange); }
.nav-dot { width: 6px; height: 6px; border-radius: 50%; background: rgba(242, 235, 221, 0.35); flex: none; transition: background 0.2s ease, box-shadow 0.2s ease; }
.nav-link:hover .nav-dot, .nav-link[aria-current="page"] .nav-dot { background: var(--neon-green); box-shadow: 0 0 8px var(--neon-green); }

/* ==== Header actions ==== */
.header-actions { flex: none; display: flex; align-items: center; gap: 10px; }
.header-search { display: inline-flex; align-items: center; gap: 10px; padding: 8px 12px; border: 1px solid rgba(242, 235, 221, 0.22); color: var(--muted-gray); font-family: var(--font-mono); font-size: 12px; transition: border-color 0.2s ease, color 0.2s ease; }
.header-search:hover { border-color: var(--neon-green); color: var(--neon-green); }
.header-search-icon { position: relative; width: 14px; height: 14px; flex: none; border: 2px solid currentColor; border-radius: 50%; opacity: 0.85; }
.header-search-icon::after { content: ""; position: absolute; width: 7px; height: 2px; right: -5px; bottom: -3px; background: currentColor; transform: rotate(45deg); border-radius: 1px; }
.header-search-kbd { font-family: var(--font-mono); font-size: 10px; padding: 2px 6px; border: 1px solid rgba(242, 235, 221, 0.3); border-radius: 3px; color: var(--muted-gray); }
.header-search:hover .header-search-kbd { border-color: var(--neon-green); }

/* ==== Nav toggle ==== */
.nav-toggle { display: none; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid rgba(242, 235, 221, 0.3); color: var(--soft-white); font-family: var(--font-display); font-size: 13px; letter-spacing: 0.1em; transition: border-color 0.2s ease, color 0.2s ease; }
.nav-toggle:hover { border-color: var(--neon-green); color: var(--neon-green); }
.nav-toggle-label { line-height: 1; }
.nav-toggle-icon { display: inline-flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle-line { height: 2px; background: currentColor; transition: transform 0.25s ease, opacity 0.25s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* ==== Header ruler ==== */
.header-ruler { position: relative; height: 2px; overflow: hidden; background: linear-gradient(90deg, var(--electric-purple) 0%, var(--data-blue) 40%, var(--neon-green) 75%, transparent 100%); opacity: 0.75; }
.header-ruler-scan { position: absolute; top: 0; bottom: 0; width: 50%; background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent); transform: skewX(-20deg); animation: rulerScan 3.2s ease-in-out infinite; }

/* ==== Buttons ==== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 20px; border: 1px solid transparent; font-family: var(--font-display); font-size: 14px; font-weight: 700; letter-spacing: 0.08em; line-height: 1; transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease; white-space: nowrap; }
.btn-primary { background: var(--neon-green); color: var(--ink-black); clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px)); }
.btn-primary:hover { background: var(--electric-purple); color: var(--soft-white); transform: translateY(-1px); }
.btn-glow { filter: drop-shadow(0 0 6px rgba(57, 255, 20, 0.4)); }
.btn-glow:hover { filter: drop-shadow(0 0 14px rgba(138, 43, 226, 0.7)); }
.btn-ghost { border-color: var(--electric-purple); color: var(--electric-purple); background: transparent; }
.btn-ghost:hover { background: var(--electric-purple); color: var(--soft-white); }
.btn-sm { padding: 7px 14px; font-size: 12px; }
.btn-arrow { font-family: var(--font-mono); font-size: 15px; transition: transform 0.25s ease; }
.btn:hover .btn-arrow { transform: translateX(3px); }

/* ==== Footer ==== */
.site-footer { position: relative; background: var(--ink-black); color: var(--soft-white); border-top: 1px solid rgba(138, 43, 226, 0.4); margin-top: auto; }
.footer-ruler { position: relative; height: 2px; overflow: hidden; background: linear-gradient(90deg, var(--neon-green), var(--data-blue) 40%, var(--electric-purple) 70%, transparent); }
.footer-ruler-core { position: absolute; top: 0; bottom: 0; width: 20%; background: rgba(255, 255, 255, 0.6); transform: skewX(-20deg); animation: rulerScan 4s linear infinite; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1.2fr 1.4fr; gap: clamp(32px, 4vw, 64px); max-width: 1280px; margin: 0 auto; padding: clamp(40px, 6vw, 72px) clamp(20px, 4vw, 40px) 32px; }
.footer-brand-col { min-width: 0; }
.footer-brand-link { margin-bottom: 18px; }
.footer-about { margin-top: 18px; max-width: 36ch; color: var(--muted-gray); font-size: 14px; line-height: 1.8; }
.footer-site-tag { margin-top: 14px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; color: rgba(57, 255, 20, 0.7); }
.footer-title { display: flex; align-items: center; gap: 10px; font-size: 13px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--soft-white); padding-bottom: 10px; margin-bottom: 18px; border-bottom: 1px solid rgba(138, 43, 226, 0.4); }
.footer-title-index { font-family: var(--font-mono); font-size: 11px; color: var(--signal-orange); }
.footer-list { display: flex; flex-direction: column; gap: 2px; }
.footer-list-index { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 10px; }
.footer-link { display: inline-flex; align-items: center; gap: 10px; padding: 5px 2px; color: var(--muted-gray); font-size: 14px; transition: color 0.2s ease, padding-left 0.2s ease; }
.footer-link:hover { color: var(--neon-green); padding-left: 6px; }
.footer-link-index { font-family: var(--font-mono); font-size: 11px; color: var(--electric-purple); transition: color 0.2s ease; }
.footer-link:hover .footer-link-index { color: var(--neon-green); }
.footer-contact { display: flex; flex-direction: column; gap: 4px; margin-top: 18px; font-family: var(--font-mono); font-size: 12px; color: var(--muted-gray); }
.footer-contact-line { line-height: 1.6; }
.footer-meta-list { display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: var(--muted-gray); }
.footer-meta-list li { position: relative; padding-left: 16px; }
.footer-meta-list li::before { content: "▸"; position: absolute; left: 0; color: var(--signal-orange); }
.footer-trust { margin-top: 18px; padding: 14px; border: 1px dashed rgba(242, 235, 221, 0.2); font-size: 12px; line-height: 1.7; color: var(--muted-gray); }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; max-width: 1280px; margin: 0 auto; padding: 18px clamp(20px, 4vw, 40px); border-top: 1px solid rgba(242, 235, 221, 0.12); font-family: var(--font-mono); font-size: 12px; color: var(--muted-gray); }
.footer-copyright { color: rgba(242, 235, 221, 0.7); }

/* ==== Back to top ==== */
.top-btn { position: fixed; right: 20px; bottom: 20px; z-index: 150; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: var(--electric-purple); color: var(--soft-white); border: 1px solid var(--neon-green); font-family: var(--font-mono); font-size: 16px; transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease; }
.top-btn:hover { background: var(--neon-green); color: var(--ink-black); box-shadow: 0 0 14px rgba(57, 255, 20, 0.5); }
.top-btn[hidden] { display: none; }

/* ==== Containers & grid ==== */
.container { width: 100%; max-width: 1280px; margin-inline: auto; padding-inline: clamp(20px, 4vw, 40px); }
.container--narrow { max-width: 960px; }
.container--full { max-width: none; }
.grid { display: grid; gap: clamp(16px, 2.5vw, 28px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-side { grid-template-columns: minmax(0, 1fr) 300px; }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 767px) { .grid-2, .grid-3, .grid-side { grid-template-columns: minmax(0, 1fr); } }

/* ==== Breadcrumb ==== */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; font-family: var(--font-mono); font-size: 13px; color: var(--muted-gray); }
.breadcrumb-item + .breadcrumb-item::before { content: "/"; margin-right: 6px; color: var(--signal-orange); }
.breadcrumb-item a { color: var(--electric-purple); }
.breadcrumb-item a:hover { text-decoration: underline; }
.breadcrumb-item[aria-current="page"] { color: var(--ink-brown); }

/* ==== Page head ==== */
.page-head { position: relative; padding: clamp(28px, 5vw, 56px) 0 clamp(20px, 3vw, 36px); margin-bottom: clamp(28px, 4vw, 48px); border-bottom: 1px solid var(--ink-brown); }
.page-title { font-size: clamp(28px, 5vw, 44px); letter-spacing: 0.02em; line-height: 1.15; }
.page-intro { margin-top: 10px; max-width: 64ch; font-size: 15px; }
.page-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 14px; font-family: var(--font-mono); font-size: 12px; color: var(--muted-gray); }

/* ==== Section ==== */
.section { margin-block: clamp(48px, 8vw, 96px); }
.section-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 28px; padding-bottom: 12px; border-bottom: 2px solid var(--ink-brown); }
.section-index { font-family: var(--font-mono); font-size: 14px; color: var(--signal-orange); white-space: nowrap; }
.section-title { font-size: clamp(22px, 3vw, 32px); letter-spacing: 0.02em; }
.section-line { flex: 1; height: 1px; align-self: center; background: repeating-linear-gradient(90deg, var(--ink-brown) 0 6px, transparent 6px 12px); }

/* ==== Cards ==== */
.card { position: relative; padding: 24px; background: var(--paper-cream); border: 1px solid var(--ink-brown); box-shadow: 6px 6px 0 var(--cream-deep); transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease; }
.card::before { content: attr(data-index); position: absolute; top: -10px; right: 12px; padding: 2px 8px; background: var(--electric-purple); color: var(--soft-white); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; }
.card:hover { transform: translate(-2px, -2px); box-shadow: 8px 8px 0 rgba(138, 43, 226, 0.25), 0 0 16px rgba(57, 255, 20, 0.2); border-color: var(--electric-purple); }
.card--dark { background: var(--ink-black); border-color: rgba(57, 255, 20, 0.5); color: var(--soft-white); box-shadow: 6px 6px 0 rgba(138, 43, 226, 0.4); }
.card--dark h1, .card--dark h2, .card--dark h3 { color: var(--soft-white); }
.card--dark .card-meta { color: var(--muted-gray); }
.card--neon { border: 1px solid var(--neon-green); box-shadow: 0 0 12px rgba(57, 255, 20, 0.35); }
.card--neon:hover { box-shadow: 0 0 20px rgba(57, 255, 20, 0.6); }

/* ==== Tags ==== */
.tag { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border: 1px solid currentColor; font-family: var(--font-mono); font-size: 12px; line-height: 1.6; }
.tag--green { color: var(--neon-green); background: rgba(57, 255, 20, 0.08); }
.tag--purple { color: var(--electric-purple); background: rgba(138, 43, 226, 0.08); }
.tag--orange { color: var(--signal-orange); background: rgba(255, 77, 0, 0.08); }

/* ==== Status dots ==== */
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--muted-gray); }
.status-dot--live { background: var(--neon-green); box-shadow: 0 0 8px var(--neon-green); animation: statusPulse 2s ease-in-out infinite; }
.status-dot--off { background: var(--signal-orange); }
.status-dot--idle { background: var(--muted-gray); }

/* ==== Data table ==== */
.table-wrap { overflow-x: auto; border: 1px solid var(--ink-brown); background: var(--paper-cream); }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th, .data-table td { padding: 10px 14px; border-bottom: 1px solid var(--cream-deep); text-align: left; }
.data-table th { font-family: var(--font-mono); font-size: 13px; background: var(--cream-deep); color: var(--ink-black); font-weight: 600; white-space: nowrap; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: rgba(0, 200, 255, 0.06); }
.data-number { font-family: var(--font-mono); color: var(--electric-purple); }

/* ==== Aside note & lead block ==== */
.aside-note { position: relative; padding: 18px 18px 16px; background: var(--cream-deep); border-right: 3px solid var(--signal-orange); font-size: 14px; line-height: 1.75; color: var(--ink-brown); }
.aside-note::before { content: "旁注"; display: block; margin-bottom: 8px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--signal-orange); }
.lead-block { padding: clamp(20px, 3vw, 32px); background: var(--paper-cream); border: 1px solid var(--ink-brown); border-top: 4px solid var(--electric-purple); box-shadow: 8px 8px 0 var(--cream-deep); }
.lead-block h3 { margin-bottom: 8px; }

/* ==== Screen frame / image container ==== */
.screen-frame { position: relative; overflow: hidden; background: var(--ink-black); border: 1px solid rgba(242, 235, 221, 0.25); aspect-ratio: 16 / 9; }
.screen-frame > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.92; transition: transform 0.4s ease, opacity 0.3s ease; }
.screen-frame:hover > img { transform: scale(1.02); opacity: 1; }
.screen-frame::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(circle at 22% 28%, rgba(57, 255, 20, 0.14), transparent 42%), repeating-linear-gradient(0deg, transparent 0 3px, rgba(242, 235, 221, 0.07) 3px 4px); mix-blend-mode: screen; }
.screen-frame--4-3 { aspect-ratio: 4 / 3; }
.screen-frame--1-1 { aspect-ratio: 1 / 1; }
.screen-frame--21-9 { aspect-ratio: 21 / 9; }

/* ==== Dark panel ==== */
.dark-panel { position: relative; overflow: hidden; padding: clamp(32px, 6vw, 64px); background: linear-gradient(135deg, var(--ink-black) 0%, #211B17 55%, #2A1E3D 100%); color: var(--soft-white); }
.dark-panel::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(90deg, transparent 0 calc(100% / 12), rgba(57, 255, 20, 0.05) calc(100% / 12) calc(100% / 12 + 1px)); }
.dark-panel h1, .dark-panel h2, .dark-panel h3 { color: var(--soft-white); }
.dark-panel .section-line { background: repeating-linear-gradient(90deg, rgba(242, 235, 221, 0.25) 0 6px, transparent 6px 12px); }

/* ==== Divider ==== */
.divider { border: none; height: 1px; margin: 28px 0; background: repeating-linear-gradient(90deg, var(--ink-brown) 0 8px, transparent 8px 16px); }

/* ==== Scroll spy & reveal ==== */
[data-spy] { scroll-margin-top: calc(var(--header-h) + 24px); }
section[id] { scroll-margin-top: calc(var(--header-h) + 24px); }
[data-spy-link] { transition: color 0.25s ease, border-color 0.25s ease, background-color 0.25s ease; }
[data-spy-link].is-active { color: var(--neon-green); border-color: var(--neon-green); }
[data-spy-link].is-active .status-dot { background: var(--neon-green); box-shadow: 0 0 8px var(--neon-green); }
.reveal-ready { opacity: 0; transform: translateY(14px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal-ready.is-revealed { opacity: 1; transform: none; }

/* ==== Keyframes ==== */
@keyframes statusPulse { 0%, 100% { box-shadow: 0 0 4px rgba(57, 255, 20, 0.6); } 50% { box-shadow: 0 0 12px rgba(57, 255, 20, 0.95); } }
@keyframes brandScan { 0% { top: -60%; } 60%, 100% { top: 120%; } }
@keyframes rulerScan { 0% { left: -60%; } 70%, 100% { left: 120%; } }

/* ==== Responsive: tablet & mobile ==== */
@media (max-width: 1200px) {
  .header-search-text, .header-search-kbd { display: none; }
  .header-search { padding: 9px 10px; }
  .header-tagline { display: none; }
}
@media (max-width: 1023px) {
  .header-frame { flex-wrap: nowrap; padding: 10px 16px; }
  .header-nav { position: absolute; top: 100%; left: 0; right: 0; display: block; background: var(--ink-black); border-top: 1px solid var(--electric-purple); border-bottom: 1px solid var(--neon-green); box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45); opacity: 0; transform: translateY(-10px); pointer-events: none; transition: opacity 0.25s ease, transform 0.25s ease; max-height: 80vh; overflow-y: auto; }
  .header-nav[data-open="true"] { opacity: 1; transform: none; pointer-events: auto; }
  .nav-title { display: flex; align-items: center; gap: 8px; padding: 16px 20px 6px; font-family: var(--font-display); font-size: 12px; letter-spacing: 0.2em; color: var(--muted-gray); }
  .nav-title-mark { color: var(--signal-orange); }
  .nav-list { flex-direction: column; align-items: stretch; padding: 4px 16px 16px; gap: 0; }
  .nav-item { border-bottom: 1px solid rgba(242, 235, 221, 0.08); }
  .nav-item:last-child { border-bottom: none; }
  .nav-link { padding: 14px 10px; }
  .nav-dot { margin-left: auto; }
  .nav-toggle { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand-col { grid-column: 1 / -1; }
}
@media (max-width: 767px) {
  .brand-mark { width: 36px; height: 36px; font-size: 12px; }
  .brand-name { max-width: 148px; font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
  .brand-sub { display: none; }
  .header-tagline { display: none; }
  .header-actions { gap: 8px; }
  .header-search { display: none; }
  .btn-primary { padding: 10px 12px; font-size: 12px; }
  .btn-arrow { display: none; }
  .nav-toggle { padding: 9px 10px; }
  .nav-toggle-label { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand-col { grid-column: auto; }
  .footer-bottom { justify-content: center; text-align: center; }
  .top-btn { right: 12px; bottom: 12px; width: 40px; height: 40px; }
}
@media (max-width: 399px) {
  .header-search { display: none; }
}

/* ==== Reduced motion ==== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }
  .reveal-ready, .reveal-ready.is-revealed { opacity: 1; transform: none; }
}