/* =========================================================
   新版本赛场 / 共享样式表  /assets/site.css
   00 tokens  01 reset  02 typography  03 layout
   04 header  05 footer  06 buttons  07 components
   08 media   09 motion  10 responsive
   ========================================================= */

/* ---------- 00 tokens ---------- */
:root {
  --ink-900: #071A2F;
  --ink-800: #0B2748;
  --ink-750: #0F3057;
  --cyan: #00E5C7;
  --orange: #FF6B2C;
  --cream: #F5F0E6;
  --mist: #E8EEF4;
  --brown: #1A1410;
  --red: #E2482A;
  --blue: #2D7DFF;
  --slate: #8FA3B8;

  --line: rgba(143, 163, 184, 0.22);
  --line-soft: rgba(143, 163, 184, 0.14);
  --line-strong: rgba(0, 229, 199, 0.34);
  --line-cream: rgba(26, 20, 16, 0.16);

  --font-display: "Archivo Narrow", "Roboto Condensed", "Arial Narrow",
    "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Roboto Mono", "Courier New", monospace;

  --maxw: 1360px;
  --rail: 280px;
  --header-h: 76px;
  --gutter: clamp(16px, 4vw, 48px);
  --sec-y: clamp(48px, 7vw, 96px);
  --shadow-lift: 0 18px 40px rgba(3, 12, 24, 0.45);
}

/* ---------- 01 reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; }

hr { border: 0; border-top: 1px solid var(--line); margin: 0; }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 02 typography ---------- */
body {
  background: var(--ink-900);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { line-height: 1.15; font-weight: 700; }

p { text-wrap: pretty; }

strong { color: var(--cyan); font-weight: 700; }

.mono {
  font-family: var(--font-mono);
  font-size: 0.86em;
  letter-spacing: -0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.lede {
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--slate);
  max-width: 68ch;
}

.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.9;
}

.prose > * + * { margin-top: 18px; }

.prose h2 {
  margin-top: 40px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.2vw, 30px);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.prose h3 {
  margin-top: 30px;
  font-size: 19px;
  letter-spacing: 0.02em;
}

.prose-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.prose-list li {
  position: relative;
  padding-left: 22px;
}

.prose-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.section--cream .prose-list li::before { background: var(--red); }

/* ---------- 03 layout ---------- */
.shell {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
}

.section {
  padding-block: var(--sec-y);
  border-top: 1px solid var(--line);
  position: relative;
}

.section--cream {
  background: var(--cream);
  color: var(--brown);
  border-top-color: var(--line-cream);
}

.section--cream .lede,
.section--cream .prose { color: #3B322A; }

.section--cream .eyebrow { color: var(--red); }

.section--tight { padding-block: clamp(32px, 4vw, 56px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 40px;
  margin-bottom: clamp(24px, 3vw, 44px);
}

.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 38px);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.02;
}

.section-head__text { color: var(--slate); max-width: 46ch; font-size: 15px; }

.sec-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--orange);
  margin-bottom: 10px;
}

.section--cream .sec-num { color: var(--red); }

.split {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  align-items: start;
}

.rail {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  padding-right: clamp(16px, 2vw, 28px);
  border-right: 1px solid var(--line);
}

.canvas {
  min-width: 0;
  padding-left: clamp(20px, 3vw, 48px);
}

.grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }

section[id], [data-section] { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- 04 header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.28s ease, border-color 0.28s ease;
}

.site-header.is-solid {
  background: rgba(7, 26, 47, 0.96);
  border-bottom-color: var(--line-strong);
}

.header-inner {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 36px);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 400;
  background: var(--cyan);
  color: var(--ink-900);
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: top 0.18s ease;
}

.skip-link:focus { top: 14px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  background: rgba(0, 229, 199, 0.06);
}

.brand__text { display: grid; gap: 2px; }

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mist);
  line-height: 1.1;
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--slate);
  line-height: 1.2;
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 199, 0.16);
  flex: 0 0 auto;
}

.status-dot--orange {
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 44, 0.16);
}

.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--mist);
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav-link:hover { color: var(--cyan); }

.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.site-nav + .header-actions { margin-left: 0; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 10px;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
}

.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { opacity: 0; }

/* ---------- 05 footer ---------- */
.site-footer {
  background: var(--ink-900);
  border-top: 1px solid var(--line-strong);
  position: relative;
  isolation: isolate;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(90deg, rgba(143, 163, 184, 0.08) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(143, 163, 184, 0.06) 0 1px, transparent 1px 88px);
  opacity: 0.6;
  pointer-events: none;
}

.footer-top { padding-block: clamp(40px, 6vw, 76px); }

.footer-inner {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(0, 0.8fr)) minmax(0, 1.2fr);
  gap: clamp(24px, 3vw, 48px);
  align-items: start;
}

.footer-brand { display: grid; gap: 16px; justify-items: start; }

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.footer-status {
  display: grid;
  gap: 8px;
  font-size: 13px;
  color: var(--slate);
}

.footer-status li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.footer-col { display: grid; gap: 14px; }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.footer-links { display: grid; gap: 10px; }

.footer-link {
  display: inline-block;
  font-size: 14px;
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--line-strong);
}

.footer-links--contact { gap: 14px; }

.footer-links--contact li { display: grid; gap: 3px; }

.footer-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.footer-value { font-size: 14px; color: var(--mist); word-break: break-word; }

.footer-col--contact .btn { justify-self: start; margin-top: 4px; }

.footer-base { border-top: 1px solid var(--line); background: rgba(11, 39, 72, 0.5); }

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 20px;
}

.footer-legal,
.footer-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate);
}

/* ---------- 06 buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--cyan);
  color: var(--ink-900);
  border-color: var(--cyan);
}

.btn--primary:hover { background: #33F0DA; border-color: #33F0DA; }

.btn--accent {
  background: var(--orange);
  color: var(--brown);
  border-color: var(--orange);
}

.btn--accent:hover { background: #FF824F; border-color: #FF824F; }

.btn--ghost {
  background: rgba(0, 229, 199, 0.06);
  border-color: var(--line-strong);
  color: var(--cyan);
}

.btn--ghost:hover { background: rgba(0, 229, 199, 0.14); }

.btn--quiet {
  background: transparent;
  border-color: var(--line);
  color: var(--mist);
}

.btn--quiet:hover { border-color: var(--slate); color: var(--cyan); }

.btn--sm { padding: 9px 14px; font-size: 11px; letter-spacing: 0.14em; }

.section--cream .btn--quiet { border-color: var(--line-cream); color: var(--brown); }

/* ---------- 07 components ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.tag--cyan { color: var(--cyan); border-color: var(--line-strong); background: rgba(0, 229, 199, 0.07); }
.tag--orange { color: var(--orange); border-color: rgba(255, 107, 44, 0.42); background: rgba(255, 107, 44, 0.08); }
.tag--slate { color: var(--slate); }

.panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.2vw, 28px);
  display: grid;
  gap: 12px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.panel--cyan { border-left: 3px solid var(--cyan); }
.panel--orange { border-left: 3px solid var(--orange); }
.panel--flat { background: transparent; }

.panel__title {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.5vw, 21px);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.panel__text { font-size: 15px; color: var(--slate); }

.section--cream .panel {
  background: #FFFDF8;
  border-color: var(--line-cream);
  color: var(--brown);
}

.section--cream .panel__text { color: #4A4038; }

.stat {
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(0deg, rgba(11, 39, 72, 0.85), rgba(11, 39, 72, 0.85));
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.data-table {
  width: 100%;
  min-width: 520px;
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}

.data-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  background: rgba(7, 26, 47, 0.7);
}

.data-table td { color: var(--mist); }

.data-table tbody tr:hover { background: rgba(0, 229, 199, 0.06); }

.data-table td.num,
.data-table th.num { font-family: var(--font-mono); text-align: right; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb li + li::before { content: "/"; color: var(--line-strong); }

.breadcrumb a:hover { color: var(--cyan); }

.toc-list { display: grid; gap: 4px; }

.toc-link {
  display: block;
  padding: 7px 10px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  color: var(--slate);
  transition: color 0.18s ease, border-color 0.18s ease, padding-left 0.18s ease;
}

.toc-link:hover { color: var(--mist); }

.toc-link.is-active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  padding-left: 14px;
}

.faq-list { display: grid; gap: 0; border-top: 1px solid var(--line); }

.faq-item { border-bottom: 1px solid var(--line); }

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 4px;
  text-align: left;
  font-size: 16px;
  color: var(--mist);
}

.faq-q:hover { color: var(--cyan); }

.faq-q__sign {
  font-family: var(--font-mono);
  color: var(--cyan);
  flex: 0 0 auto;
}

.faq-item.is-open .faq-q__sign { color: var(--orange); }

.faq-a {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.faq-a__inner {
  padding: 0 4px 20px;
  color: var(--slate);
  font-size: 15px;
  max-width: 70ch;
}

.section--cream .faq-list,
.section--cream .faq-item { border-color: var(--line-cream); }

.section--cream .faq-q { color: var(--brown); }
.section--cream .faq-a__inner { color: #4A4038; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.filter-btn {
  padding: 8px 14px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.filter-btn:hover { color: var(--mist); border-color: var(--slate); }

.filter-btn.is-active {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

[data-filter-item][hidden] { display: none; }

/* ---------- 08 media ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.media > img,
.media > svg,
.media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media--field {
  background-image:
    repeating-linear-gradient(90deg, rgba(0, 229, 199, 0.16) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(143, 163, 184, 0.12) 0 1px, transparent 1px 56px),
    radial-gradient(circle at 82% 18%, rgba(255, 107, 44, 0.22), transparent 58%),
    linear-gradient(160deg, #0B2748 0%, #071A2F 70%);
}

.media--stands {
  background-image:
    repeating-linear-gradient(115deg, rgba(232, 238, 244, 0.07) 0 6px, transparent 6px 18px),
    linear-gradient(180deg, rgba(7, 26, 47, 0.2), rgba(7, 26, 47, 0.9)),
    linear-gradient(120deg, #0F3057, #071A2F);
}

.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.section--cream .media { border-color: var(--line-cream); background: #EFE7D9; }
.section--cream .media__caption { color: #6A5F54; }

/* ---------- hero primitives ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
  padding-block: clamp(36px, 6vw, 76px) clamp(44px, 7vw, 96px);
}

.hero__slab {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__slab::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -8%;
  width: 44%;
  height: 130%;
  background: var(--ink-800);
  transform: skewX(-9deg);
}

.hero__slab::after {
  content: "";
  position: absolute;
  top: 0;
  right: 30%;
  width: 3px;
  height: 100%;
  background: var(--orange);
  opacity: 0.65;
}

.hero__inner { position: relative; z-index: 1; display: grid; gap: clamp(18px, 2.4vw, 30px); }

.hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(38px, 7vw, 88px);
  line-height: 0.95;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--mist);
  max-width: 18ch;
}

.hero__title em { font-style: normal; color: var(--cyan); }

.hero__lede { max-width: 62ch; color: var(--slate); font-size: clamp(15px, 1.2vw, 18px); }

.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 44px);
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.hero__meta-item {
  display: grid;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.hero__meta-item b { color: var(--cyan); font-weight: 400; }

/* ---------- 09 motion ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

[data-reveal].is-in { opacity: 1; transform: none; }

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--cyan);
  z-index: 220;
}

.to-top {
  position: fixed;
  right: clamp(14px, 2vw, 26px);
  bottom: clamp(14px, 2vw, 26px);
  z-index: 200;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: rgba(7, 26, 47, 0.92);
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 16px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
}

.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }

.to-top:hover { background: rgba(0, 229, 199, 0.14); }

/* ---------- 10 responsive ---------- */
@media (max-width: 1280px) {
  .header-status { display: none; }
}

@media (max-width: 1080px) {
  :root { --header-h: 68px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    margin-left: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: rgba(7, 26, 47, 0.985);
    border-top: 1px solid var(--line-strong);
    border-bottom: 1px solid var(--line-strong);
    padding: 12px 0 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: min(100% - (var(--gutter) * 2), var(--maxw));
    margin-inline: auto;
  }

  .nav-link {
    padding: 15px 2px;
    border-bottom: 1px solid var(--line-soft);
    border-left: 2px solid transparent;
    font-size: 15px;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--line-soft);
    border-left-color: var(--cyan);
    padding-left: 12px;
  }

  .header-actions { margin-left: auto; }

  html.nav-open { overflow: hidden; }

  .split { grid-template-columns: minmax(0, 1fr); }

  .rail {
    position: static;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 20px;
    margin-bottom: 28px;
  }

  .canvas { padding-left: 0; }

  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .grid--split { grid-template-columns: minmax(0, 1fr); }

  .data-table { min-width: 460px; }
}

@media (max-width: 620px) {
  :root { --sec-y: clamp(36px, 9vw, 56px); }

  .brand__line { display: none; }

  .header-actions .btn { display: none; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }

  .footer-base__inner { flex-direction: column; align-items: flex-start; }

  .hero__title { font-size: clamp(34px, 11vw, 54px); }

  .to-top { width: 40px; height: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] { opacity: 1; transform: none; }
}