/* ==========================================================================
   爱游戏体育CN · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

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

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

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

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

table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: var(--orange); color: #0A0C10; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色板 */
  --ink: #07090C;
  --panel: #10141C;
  --grid: #2B3444;
  --white: #F5F8FC;
  --muted: #98A4B5;
  --orange: #FF6A1A;
  --blue: #2F6BFF;
  --green: #46F0A6;
  --ember: #3A1E0E;

  /* 形状 */
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-pill: 999px;

  /* 节奏 */
  --header-h: 72px;
  --maxw: 1280px;
  --gutter: clamp(20px, 4vw, 40px);
  --ease: cubic-bezier(.2, .7, .2, 1);

  /* 字体 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Liberation Mono", monospace;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: clamp(15.5px, 1.05vw, 17px);
  line-height: 1.8;
  color: var(--white);
  background-color: var(--ink);
  background-image:
    radial-gradient(1200px 620px at 88% -12%, rgba(47, 107, 255, .16), transparent 62%),
    radial-gradient(900px 520px at 2% 6%, rgba(255, 106, 26, .10), transparent 60%),
    linear-gradient(to right, rgba(43, 52, 68, .30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 52, 68, .30) 1px, transparent 1px);
  background-size: auto, auto, 72px 72px, 72px 72px;
  background-attachment: fixed, fixed, scroll, scroll;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

p { max-width: 68ch; }
p + p { margin-top: 1.4em; }

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

h1 { font-size: clamp(30px, 5.4vw, 50px); font-weight: 900; letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 3.4vw, 34px); }
h3 { font-size: clamp(19px, 2.2vw, 24px); }
h4 { font-size: clamp(17px, 1.6vw, 19px); }

strong { color: var(--white); font-weight: 800; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.muted { color: var(--muted); }

.headline {
  font-weight: 900;
  letter-spacing: -0.02em;
  transform: skewX(-2deg);
}

.lead {
  font-size: clamp(17px, 1.55vw, 19px);
  line-height: 1.85;
  color: #C9D3E1;
  max-width: 68ch;
}

#main-content { display: block; }
#main-content:focus { outline: none; }

/* ---------- 4. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 880px; }

.section { padding-block: clamp(56px, 8vw, 118px); }
.section--tight { padding-block: clamp(34px, 5vw, 66px); }

.section-head {
  display: grid;
  gap: 14px;
  max-width: 74ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--orange);
}

.kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--orange);
  flex: 0 0 auto;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 28px);
}

.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-12 { grid-column: span 12; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
    background-color .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}

.btn-primary {
  background: var(--orange);
  color: #170A02;
  box-shadow: 0 0 0 0 rgba(255, 106, 26, .45);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(255, 106, 26, .34);
}

.btn-ghost {
  border-color: var(--grid);
  color: var(--white);
  background: rgba(16, 20, 28, .7);
}

.btn-ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.btn-capsule { padding: 10px 18px; font-size: 14px; }

/* ---------- 6. 页头 · 命令栏 ---------- */
.skip-link {
  position: absolute;
  top: -64px;
  left: var(--gutter);
  z-index: 200;
  display: inline-flex;
  align-items: center;
  padding: 11px 20px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--orange);
  color: #170A02;
  font-weight: 800;
  font-size: 14px;
  transition: top .2s var(--ease);
}

.skip-link:focus { top: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(7, 9, 12, .88);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--grid);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 106, 26, .12), transparent 34%, rgba(47, 107, 255, .14));
  pointer-events: none;
}

.site-header.is-condensed { --header-h: 56px; }

.header-grid {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
  transition: height .3s var(--ease);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(140deg, var(--orange), #B33F02);
  box-shadow: 0 0 0 1px rgba(255, 106, 26, .35), 0 6px 18px rgba(255, 106, 26, .22);
}

.brand-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #0A0C10;
  animation: pulseDot 2.4s var(--ease) infinite;
}

.brand-text { display: grid; min-width: 0; }

.brand-name {
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: var(--white);
  white-space: nowrap;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  display: flex;
  justify-content: center;
  min-width: 0;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  transition: color .25s var(--ease), background-color .25s var(--ease), box-shadow .25s var(--ease);
}

.nav-link:hover {
  color: var(--white);
  background: rgba(43, 52, 68, .55);
}

.nav-link[aria-current="page"] {
  color: var(--white);
  background: rgba(255, 106, 26, .12);
  box-shadow: inset 0 0 0 1px rgba(255, 106, 26, .38);
}

.nav-label { white-space: nowrap; }

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: #5F6B7C;
  transition: color .25s var(--ease);
}

.nav-dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grid);
  transition: background-color .25s var(--ease), box-shadow .25s var(--ease);
}

.nav-link[aria-current="page"] .nav-index { color: var(--orange); }

.nav-link[aria-current="page"] .nav-dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, .18);
  animation: pulseDot 2.4s var(--ease) infinite;
}

/* 右侧区 */
.header-side {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
}

.header-position {
  display: none;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

.header-position::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(70, 240, 166, .14);
  animation: pulseDot 2.4s var(--ease) infinite;
}

.site-header.is-condensed .header-position { display: inline-flex; }
.site-header.is-condensed .brand-sub { display: none; }
.site-header.is-condensed .nav-index,
.site-header.is-condensed .nav-dot { display: none; }
.site-header.is-condensed .nav-link { padding: 7px 11px; font-size: 13px; }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  background: rgba(16, 20, 28, .92);
  color: var(--white);
  font-size: 13px;
  font-weight: 800;
}

.nav-toggle-box {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bar {
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .25s var(--ease), opacity .25s var(--ease);
}

.nav-toggle[aria-expanded="true"] { border-color: var(--orange); color: var(--orange); }
.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); }

/* 滚动脉冲线 */
.scroll-pulse {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(43, 52, 68, .65);
  overflow: hidden;
}

.scroll-pulse-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--blue));
  transition: width .12s linear;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(72px, 10vw, 140px);
  background: linear-gradient(180deg, rgba(16, 20, 28, .72), rgba(7, 9, 12, 1) 70%);
  border-top: 1px solid var(--grid);
}

.pulse-strip {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 42px;
  padding-inline: var(--gutter);
  border-bottom: 1px solid rgba(43, 52, 68, .7);
  overflow: hidden;
}

.pulse-strip-bar {
  flex: 1;
  height: 2px;
  border-radius: 2px;
  background: rgba(43, 52, 68, 1);
  transform-origin: center;
  animation: pulseBar 2.4s var(--ease) infinite;
}

.pulse-strip-bar:nth-child(3n) { background: rgba(255, 106, 26, .6); }
.pulse-strip-bar:nth-child(3n + 1) { background: rgba(47, 107, 255, .55); }
.pulse-strip-bar:nth-child(1) { animation-delay: 0s; }
.pulse-strip-bar:nth-child(2) { animation-delay: .1s; }
.pulse-strip-bar:nth-child(3) { animation-delay: .2s; }
.pulse-strip-bar:nth-child(4) { animation-delay: .3s; }
.pulse-strip-bar:nth-child(5) { animation-delay: .4s; }
.pulse-strip-bar:nth-child(6) { animation-delay: .5s; }
.pulse-strip-bar:nth-child(7) { animation-delay: .6s; }
.pulse-strip-bar:nth-child(8) { animation-delay: .7s; }
.pulse-strip-bar:nth-child(9) { animation-delay: .8s; }
.pulse-strip-bar:nth-child(10) { animation-delay: .9s; }
.pulse-strip-bar:nth-child(11) { animation-delay: 1s; }
.pulse-strip-bar:nth-child(12) { animation-delay: 1.1s; }

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.5fr;
  gap: clamp(26px, 3.4vw, 44px);
}

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

.brand--footer { margin-bottom: 18px; }

.footer-claim {
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.footer-icp {
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: #6E7B8D;
}

.footer-title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-title::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--orange);
  flex: 0 0 auto;
}

.footer-list { display: grid; gap: 2px; }

.footer-list--contact { gap: 8px; }

.footer-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 0;
  font-size: 14.5px;
  font-weight: 600;
  color: #C7D1DF;
  transition: color .22s var(--ease), transform .22s var(--ease);
}

.footer-link:hover {
  color: var(--orange);
  transform: translateX(4px);
}

.footer-link--inline {
  padding: 0;
  color: var(--white);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: rgba(255, 106, 26, .7);
  text-underline-offset: 4px;
}

.footer-link--inline:hover { transform: none; }

.footer-value {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--white);
  word-break: break-word;
}

.footer-list--contact .footer-value:first-child { color: var(--orange); }

.footer-note {
  max-width: 40ch;
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--muted);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  margin-top: clamp(36px, 5vw, 62px);
  padding: 20px 0 30px;
  border-top: 1px solid var(--grid);
}

.footer-copy {
  max-width: none;
  font-size: 12.5px;
  color: var(--muted);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-size: 12.5px;
  color: var(--muted);
}

.footer-legal .footer-link { padding: 0; font-size: 12.5px; }

/* ---------- 8. 通用组件 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
}

.breadcrumb-link { color: var(--muted); transition: color .22s var(--ease); }
.breadcrumb-link:hover { color: var(--orange); }
.breadcrumb-sep { color: #3D4859; }
.breadcrumb-current { color: var(--white); }

.panel {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(16, 20, 28, .96), rgba(10, 13, 18, .9));
  transition: border-color .28s var(--ease), transform .28s var(--ease);
}

.panel--ember {
  background: linear-gradient(150deg, var(--ember), rgba(16, 20, 28, .92));
  border-color: rgba(255, 106, 26, .38);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 13px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  background: rgba(16, 20, 28, .78);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.chip--live {
  color: var(--green);
  border-color: rgba(70, 240, 166, .42);
}

.chip--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: pulseDot 2.4s var(--ease) infinite;
}

.chip--plan {
  color: var(--orange);
  border-color: rgba(255, 106, 26, .45);
}

.img-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--grid);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(140deg, rgba(47, 107, 255, .20), rgba(255, 106, 26, .14) 70%),
    var(--panel);
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 42%, rgba(7, 9, 12, .6));
  pointer-events: none;
}

.img-frame::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), rgba(47, 107, 255, .6) 55%, transparent);
  z-index: 2;
  pointer-events: none;
}

.img-frame--wide { aspect-ratio: 21 / 9; }
.img-frame--tall { aspect-ratio: 4 / 5; }
.img-frame--slant { transform: rotate(-1.4deg); }

.img-caption {
  max-width: 60ch;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.pulse-divider {
  position: relative;
  height: 1px;
  margin-block: clamp(46px, 7vw, 96px);
  background: var(--grid);
}

.pulse-divider-line {
  position: absolute;
  left: 0;
  top: -1px;
  width: 0;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 106, 26, 0));
  transition: width .6s var(--ease);
}

.pulse-divider.is-in .pulse-divider-line { width: 58%; }

.section-nav {
  position: sticky;
  top: calc(var(--header-h) + 26px);
  font-family: var(--font-mono);
}

.section-nav-title {
  margin-bottom: 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-nav-list {
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--grid);
}

.section-nav-link {
  display: block;
  margin-left: -1.5px;
  padding: 8px 0 8px 14px;
  border-left: 2px solid transparent;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

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

.section-nav-link[aria-current="true"] {
  color: var(--white);
  border-color: var(--orange);
}

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

.back-to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 26px);
  bottom: clamp(14px, 2.4vw, 26px);
  z-index: 95;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 20px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  background: rgba(16, 20, 28, .94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--white);
  font-size: 13px;
  font-weight: 800;
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity .3s var(--ease), transform .3s var(--ease), border-color .3s var(--ease);
}

.back-to-top::before {
  content: "";
  width: 8px;
  height: 8px;
  border-left: 2px solid var(--orange);
  border-top: 2px solid var(--orange);
  transform: rotate(45deg) translate(1px, 1px);
}

.back-to-top.is-visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.back-to-top:hover { border-color: var(--orange); }

[data-section] { scroll-margin-top: calc(var(--header-h) + 26px); }

/* ---------- 9. 动效关键帧 ---------- */
@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(.68); opacity: .55; }
}

@keyframes pulseBar {
  0%, 100% { transform: scaleY(1); opacity: .55; }
  50% { transform: scaleY(5); opacity: 1; }
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1040px) {
  .site-header { --header-h: 64px; }

  .header-grid { grid-template-columns: 1fr auto; gap: 14px; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    z-index: 88;
    display: block;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 16px var(--gutter) 28px;
    background: rgba(9, 12, 16, .98);
    border-bottom: 1px solid var(--grid);
    box-shadow: 0 24px 48px rgba(0, 0, 0, .5);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s var(--ease);
  }

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

  .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }

  .nav-item + .nav-item { border-top: 1px solid rgba(43, 52, 68, .55); }

  .nav-link {
    justify-content: flex-start;
    padding: 15px 14px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: 16px;
  }

  .nav-link[aria-current="page"] { border-color: rgba(255, 106, 26, .42); }

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

  .header-position { display: none !important; }
}

@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
}

@media (max-width: 640px) {
  .nav-toggle-text { display: none; }
  .nav-toggle { padding: 10px 13px; }
  .btn-capsule { padding: 9px 14px; font-size: 13px; }
  .brand-name { font-size: 15px; }
  .brand-sub { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .img-frame--slant { transform: none; }
}

/* ---------- 11. 降级与可访问性 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .reveal { opacity: 1; transform: none; }
  .pulse-divider-line { width: 58%; }
  .scroll-pulse-fill { transition: none; }
  .back-to-top { transition: opacity .001ms linear; }
}