/* ==========================================================================
   M6娱乐中心 — 共享站点样式 /assets/site.css
   深空夜幕 + 奶油纸片的目录型内容地图
   ========================================================================== */

:root {
  --void: #0B1030;
  --nebula: #26195C;
  --violet: #6C4BE0;
  --cyan: #35E6D0;
  --amber: #FF8A3D;
  --cream: #F3E9D2;
  --ink: #221812;
  --rust: #C8462B;
  --grid: #1E2A5C;
  --lavender: #A9A3C9;

  --text: #DFDCF0;
  --text-soft: #D5D1EC;
  --text-dim: var(--lavender);
  --paper-line: rgba(34, 24, 18, 0.16);
  --hair: rgba(169, 163, 201, 0.24);

  --font-display: "Archivo Black", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --step-1: 12px;
  --step-2: 14px;
  --step-3: 16px;
  --step-4: 18px;
  --step-5: 24px;
  --step-6: 36px;
  --step-7: 64px;
  --step-8: 132px;

  --wrap: 1200px;
  --pad: clamp(20px, 4vw, 48px);
  --gap: clamp(16px, 2.4vw, 32px);
  --ease: cubic-bezier(0.22, 0.7, 0.3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

html[data-nav-open="true"] { overflow: hidden; }

body {
  margin: 0;
  min-height: 100%;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-3);
  line-height: 1.75;
  background-color: var(--void);
  background-image:
    radial-gradient(62vw 62vw at 82% -12%, rgba(108, 75, 224, 0.42), transparent 64%),
    radial-gradient(46vw 46vw at 2% 14%, rgba(53, 230, 208, 0.13), transparent 70%),
    radial-gradient(48vw 48vw at 62% 112%, rgba(255, 138, 61, 0.12), transparent 70%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

img, svg, video { max-width: 100%; }
img { border: 0; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--cream);
}

p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; }
a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
button { font: inherit; color: inherit; }
hr { border: 0; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

::selection {
  background: var(--cyan);
  color: var(--void);
}

main:focus { outline: none; }

/* ---------- 基础排版工具 ---------- */
.display {
  font-family: var(--font-display);
  font-size: clamp(40px, 8vw, 132px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--cream);
  margin: 0;
}

.display--sub {
  font-size: clamp(26px, 3.6vw, 56px);
  line-height: 1;
}

.eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.section-title {
  font-size: clamp(26px, 3.6vw, 56px);
  margin: 0;
}

.section-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 64px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: rgba(169, 163, 201, 0.3);
  transition: color 320ms var(--ease);
}

.lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 34em;
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.prose {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-soft);
}

.prose p { margin: 0 0 1em; }
.prose strong { color: var(--cream); font-weight: 600; }
.prose--paper { color: var(--ink); }
.prose--paper strong { color: var(--ink); }
.prose--paper a { color: var(--rust); }

/* ---------- 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 48px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.grid-split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--gap);
  align-items: start;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
}

.stack { display: grid; gap: 12px; }

/* ---------- 面：纸片 / 卡片 ---------- */
.paper {
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--paper-line);
  padding: clamp(20px, 3vw, 40px);
}

.paper h2, .paper h3, .paper h4 { color: var(--ink); }
.paper p { color: var(--ink); }
.paper a { color: var(--rust); }

.card {
  position: relative;
  background: rgba(38, 25, 92, 0.62);
  border: 1px solid var(--grid);
  padding: clamp(18px, 2.4vw, 28px);
  transition: border-color 260ms var(--ease), transform 300ms var(--ease);
}

.card:hover { border-color: rgba(53, 230, 208, 0.55); }

.card--flat {
  background: transparent;
  border-color: var(--hair);
}

.card--amber { border-left: 2px solid var(--amber); }
.card--cyan { border-left: 2px solid var(--cyan); }

.card-title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--step-4);
  line-height: 1.4;
  color: var(--cream);
  margin: 0 0 8px;
}

/* ---------- 按钮 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease),
              background-color 220ms var(--ease), color 220ms var(--ease),
              border-color 220ms var(--ease);
}

.btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: #1A0F08;
}

.btn--amber:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--cyan);
}

.btn--ghost {
  background: transparent;
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--ghost:hover {
  background: var(--cyan);
  color: var(--void);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(108, 75, 224, 0.6);
}

.btn--paper {
  background: var(--cream);
  border-color: var(--ink);
  color: var(--ink);
}

.btn--paper:hover {
  background: var(--ink);
  color: var(--cream);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--rust);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--hair);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  background: transparent;
}

.chip--cyan { border-color: var(--cyan); color: var(--cyan); }
.chip--amber { border-color: var(--amber); color: var(--amber); background: rgba(255, 138, 61, 0.1); }
.chip--rust { border-color: var(--rust); color: var(--rust); background: rgba(200, 70, 43, 0.08); }

.index-code {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--grid);
  border-radius: 2px;
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.index-code:hover { border-color: var(--cyan); }

.index-code[data-copied="true"] {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 图片容器（页面阶段放置占位） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--grid);
  background-color: var(--nebula);
  background-image:
    radial-gradient(120% 120% at 18% 0%, rgba(108, 75, 224, 0.6), transparent 62%),
    radial-gradient(90% 90% at 92% 104%, rgba(53, 230, 208, 0.3), transparent 66%),
    radial-gradient(60% 60% at 70% 30%, rgba(255, 138, 61, 0.18), transparent 70%);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    115deg,
    rgba(255, 255, 255, 0.12) 0 11%,
    transparent 11.4% 58%,
    rgba(255, 138, 61, 0.14) 58% 62%,
    transparent 62.4%
  );
}

.media > img,
.media > svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--paper { background-color: var(--cream); border-color: var(--paper-line); }

.media__index {
  position: absolute;
  z-index: 2;
  left: 14px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.media__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* ---------- 分隔与面包屑 ---------- */
.rule {
  height: 1px;
  border: 0;
  margin: clamp(24px, 4vw, 56px) 0;
  background: var(--grid);
}

.rule--slant {
  height: 1px;
  border: 0;
  margin: clamp(28px, 5vw, 64px) 0;
  background: linear-gradient(90deg, var(--grid), rgba(53, 230, 208, 0.35), var(--grid));
  transform: skewY(-1.2deg);
}

.hairline { height: 1px; border: 0; background: var(--hair); margin: 0; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: rgba(169, 163, 201, 0.5); }
.breadcrumb a { color: inherit; text-decoration: none; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--cream); }

/* ---------- 工具类 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  left: 8px;
  top: -80px;
  z-index: 300;
  padding: 12px 18px;
  background: var(--amber);
  color: #1A0F08;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: top 200ms var(--ease);
}

.skip-link:focus { top: 8px; }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(11, 16, 48, 0.97), rgba(11, 16, 48, 0.86));
  border-bottom: 1px solid var(--grid);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 12px var(--pad);
  min-height: 76px;
}

.brand {
  order: 1;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--cream);
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 230, 208, 0.16), 0 0 18px rgba(53, 230, 208, 0.85);
  animation: brand-breathe 9s ease-in-out infinite;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cream);
  white-space: nowrap;
}

.brand-tag {
  padding-left: 12px;
  border-left: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--lavender);
  white-space: nowrap;
}

.header-status {
  order: 2;
  margin: 0 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.06em;
  color: var(--lavender);
  white-space: nowrap;
}

.status-key { color: var(--cyan); }
.status-sep { color: rgba(169, 163, 201, 0.5); }

.nav-toggle {
  order: 3;
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--grid);
  border-radius: 0;
  color: var(--cream);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

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

.nav-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 240ms var(--ease), opacity 240ms var(--ease);
}

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

.site-nav {
  order: 4;
  flex: 0 0 auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px 12px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 240ms var(--ease), border-color 240ms var(--ease),
              background-color 240ms var(--ease);
}

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

.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: rgba(53, 230, 208, 0.07);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  pointer-events: none;
}

.progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 62%, var(--amber));
  box-shadow: 0 0 12px rgba(53, 230, 208, 0.6);
  transition: width 120ms linear;
}

@keyframes brand-breathe {
  0%, 100% { box-shadow: 0 0 0 4px rgba(53, 230, 208, 0.14), 0 0 14px rgba(53, 230, 208, 0.7); }
  50% { box-shadow: 0 0 0 6px rgba(53, 230, 208, 0.22), 0 0 24px rgba(53, 230, 208, 0.95); }
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 9vw, 120px);
  padding-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--grid);
  background-color: var(--nebula);
  background-image:
    repeating-linear-gradient(90deg, transparent 0 79px, rgba(169, 163, 201, 0.08) 79px 80px),
    repeating-linear-gradient(0deg, transparent 0 79px, rgba(169, 163, 201, 0.05) 79px 80px);
  color: var(--text-soft);
}

.footer-glow {
  position: absolute;
  top: -160px;
  right: -140px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(108, 75, 224, 0.55), rgba(108, 75, 224, 0) 68%);
  animation: brand-breathe-soft 12s ease-in-out infinite;
}

@keyframes brand-breathe-soft {
  0%, 100% { opacity: 0.72; }
  50% { opacity: 1; }
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.15fr;
  gap: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(32px, 5vw, 56px);
}

.footer-brand { min-width: 0; }

.brand--footer { margin-bottom: 14px; }
.brand--footer .brand-name { font-size: 17px; }

.footer-line {
  max-width: 24em;
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

.footer-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-quick a {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--grid);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: border-color 220ms var(--ease), color 220ms var(--ease),
              background-color 220ms var(--ease);
}

.footer-quick a:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(53, 230, 208, 0.08);
}

.footer-col { min-width: 0; }

.footer-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--cyan);
  line-height: 1.4;
}

.footer-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-list a {
  position: relative;
  display: inline-block;
  padding-left: 14px;
  color: var(--text-soft);
  font-size: 14px;
  text-decoration: none;
  transition: color 220ms var(--ease);
}

.footer-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--lavender);
  transition: background-color 220ms var(--ease);
}

.footer-list a:hover { color: var(--cyan); }
.footer-list a:hover::before { background: var(--cyan); }

.footer-contact {
  display: grid;
  gap: 10px;
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  font-size: 14px;
}

.footer-contact .k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lavender);
}

.footer-contact .v {
  display: block;
  color: var(--cream);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.footer-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--lavender);
  max-width: 26em;
}

.footer-mono {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--lavender);
  line-height: 1.6;
}

.footer-col .footer-mono { margin-top: 14px; }

.footer-base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding: 18px 0 26px;
  border-top: 1px solid rgba(169, 163, 201, 0.22);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-legal a {
  color: var(--lavender);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.footer-legal a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 动效协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 300ms var(--ease), transform 300ms var(--ease);
}

[data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

[data-spy] {
  border-left: 2px solid transparent;
  transition: border-color 320ms var(--ease), padding-left 320ms var(--ease);
}

[data-spy][data-active="true"] {
  border-left-color: var(--cyan);
  padding-left: clamp(12px, 2vw, 24px);
}

[data-spy][data-active="true"] .section-num { color: var(--cyan); }

/* ---------- 平板 / 手机 ---------- */
@media (max-width: 1023px) {
  html { scroll-padding-top: 132px; }

  .header-rail {
    gap: 10px 16px;
    padding: 10px var(--pad) 12px;
    min-height: 64px;
  }

  .brand { order: 1; }
  .nav-toggle { order: 2; display: inline-flex; margin-left: auto; }
  .header-status {
    order: 3;
    flex: 1 0 100%;
    margin-left: 0;
    padding-left: 0;
    padding-top: 8px;
    border-left: 0;
    border-top: 1px solid var(--grid);
    white-space: normal;
    font-size: 11px;
  }

  .site-nav {
    order: 5;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 80;
    width: min(320px, 86vw);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 88px 20px 32px;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--nebula), var(--void) 78%);
    border-left: 1px solid var(--grid);
    box-shadow: -28px 0 0 100vmax rgba(6, 9, 28, 0.62);
    transform: translateX(103%);
    visibility: hidden;
    transition: transform 320ms var(--ease), visibility 320ms var(--ease);
  }

  .site-nav[data-open] {
    transform: none;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    padding: 13px 14px;
    font-size: 15px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--cyan);
    background: rgba(53, 230, 208, 0.09);
  }

  .grid-12 > [class*="col-"] { grid-column: span 12; }
  .grid-split { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .brand-tag { display: none; }
  .brand-name { font-size: 17px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .media--wide { aspect-ratio: 16 / 9; }
}

@media (max-width: 420px) {
  .nav-toggle-label { display: none; }
  .nav-toggle { padding: 10px; }
}

/* ---------- 可访问性降级 ---------- */
@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;
  }

  .site-nav { transition: none; }
  .progress-fill { transition: none; }
}