/* ==========================================================================
   爱游戏主站 · 共享站点样式 /assets/site.css
   01 重置  02 设计令牌  03 基础排版  04 布局工具  05 通用组件
   06 站点头部  07 站点页脚  08 响应式  09 动效降级
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: #0A1F1A;
}

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

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

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

img { height: auto; }

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

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

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

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

/* 02 设计令牌 -------------------------------------------------------------- */
:root {
  --ink: #0A1F1A;
  --ink-2: #123129;
  --line: #1D463B;
  --paper: #F5F0E4;
  --paper-2: #E4DBC6;
  --cyan: #33F0CE;
  --cyan-deep: #0F8F7B;
  --orange: #FF6A2B;
  --amber: #FFB347;
  --mist: #8FA69E;
  --alert: #E0503C;

  --channel: var(--cyan);
  --channel-soft: rgba(51, 240, 206, 0.14);

  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --gutter: clamp(16px, 4vw, 56px);
  --radius: 2px;
  --ease: 160ms cubic-bezier(0.2, 0.7, 0.3, 1);
  --shadow-paper: 6px 6px 0 var(--line);
}

html[data-channel="legacy"] {
  --channel: var(--amber);
  --channel-soft: rgba(255, 179, 71, 0.16);
}

/* 03 基础排版 -------------------------------------------------------------- */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    radial-gradient(75% 50% at 88% -6%, rgba(51, 240, 206, 0.1), transparent 65%),
    radial-gradient(60% 42% at -4% 6%, rgba(255, 179, 71, 0.08), transparent 65%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
}

main { flex: 1 0 auto; }

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--paper);
}

h1 { font-size: clamp(28px, 4vw, 48px); }
h2 { font-size: clamp(23px, 3vw, 34px); }
h3 { font-size: clamp(18px, 2vw, 20px); line-height: 1.35; }
h4 { font-size: 16px; line-height: 1.4; }

p { max-width: 68ch; }

.display {
  font-family: var(--display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(30px, 5vw, 64px);
}

.lede {
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.75;
  color: var(--paper);
  max-width: 62ch;
}

.serif { font-family: var(--serif); font-weight: 600; }

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

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

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

::selection {
  background: var(--cyan);
  color: #04201B;
}

/* 04 布局工具 -------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 840px; }

.section { padding-block: clamp(40px, 6vw, 88px); }

.section--stand { background: var(--ink-2); }

.section--paper {
  background: var(--paper);
  color: var(--ink);
}

.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4 { color: var(--ink); }

.section--paper .muted { color: #4B615A; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(20px, 3vw, 36px);
}

.section--paper .section__head { border-bottom-color: var(--paper-2); }

.grid {
  display: grid;
  gap: clamp(16px, 2.5vw, 32px);
}

.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)); }

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1em; }
.prose a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.section--paper .prose a { color: var(--cyan-deep); }

/* 05 通用组件 -------------------------------------------------------------- */
.breadcrumbs {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  padding-block: 14px;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55em;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.55em;
  color: var(--line);
}

.breadcrumbs a { color: var(--mist); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--paper); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--orange);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.22em 0.6em;
  border: 1px solid var(--line);
  background: rgba(245, 240, 228, 0.04);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.tag--accent { color: var(--cyan); border-color: var(--cyan-deep); }
.tag--legacy { color: var(--amber); border-color: var(--amber); }
.tag--alert { color: var(--alert); border-color: var(--alert); }

.section--paper .tag {
  color: #4B615A;
  border-color: var(--paper-2);
  background: rgba(10, 31, 26, 0.04);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.72em 1.2em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: center;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
}

.btn:hover {
  border-color: var(--channel);
  color: var(--channel);
  transform: translateX(4px);
}

.btn--cta {
  background: var(--orange);
  border-color: var(--orange);
  color: #1A0E07;
}

.btn--cta:hover {
  background: #FF8149;
  border-color: #FF8149;
  color: #1A0E07;
}

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

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

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

.btn--paper:hover {
  background: var(--paper-2);
  border-color: var(--paper-2);
  color: var(--ink);
}

.paper {
  position: relative;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--paper-2);
  padding: clamp(18px, 2.6vw, 32px);
}

.paper h1, .paper h2, .paper h3, .paper h4 { color: var(--ink); }
.paper .mono { color: #3C5049; }
.paper a { color: var(--cyan-deep); }

.paper--stack { box-shadow: var(--shadow-paper); }

.timeline {
  border-left: 1px solid var(--line);
  padding-left: 0;
}

.timeline__item {
  position: relative;
  padding: 0 0 26px 26px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.62em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 1px solid var(--channel);
}

.timeline__item[data-state="next"]::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.18);
}

.timeline__item:last-child { padding-bottom: 0; }

.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, var(--ink-2), var(--ink));
  aspect-ratio: 16 / 10;
}

.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.04);
}

.figure--wide { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 4 / 5; }
.figure--square { aspect-ratio: 1 / 1; }

.figure__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: rgba(143, 166, 158, 0.62);
  background: repeating-linear-gradient(135deg, rgba(29, 70, 59, 0.5) 0 2px, transparent 2px 14px);
}

.figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.7em 0.9em;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: linear-gradient(transparent, rgba(10, 31, 26, 0.88));
}

/* 06 站点头部 -------------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 200;
  padding: 0.6em 1em;
  background: var(--cyan);
  color: #04201B;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: top var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 10px 24px rgba(4, 14, 11, 0.5);
}

.progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--amber), var(--cyan));
  z-index: 2;
}

/* 刻度条 */
.scorebar {
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.scorebar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.4vw, 30px);
  max-width: 1600px;
  margin-inline: auto;
  padding: 6px clamp(12px, 3vw, 28px);
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.scorebar__inner::-webkit-scrollbar { display: none; }

.scorebar__cell {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  flex: none;
}

.scorebar__cell--mono { color: var(--paper); }

.scorebar__cell--muted { color: rgba(143, 166, 158, 0.72); }

.scorebar__cell--right {
  margin-left: auto;
  color: var(--channel);
}

.scorebar__num {
  color: var(--orange);
  font-weight: 700;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--orange);
  animation: pulse-dot 2.4s ease-out infinite;
}

@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(255, 106, 43, 0.55); }
  70% { box-shadow: 0 0 0 7px rgba(255, 106, 43, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 106, 43, 0); }
}

/* 框架 */
.frame {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  max-width: 1600px;
  margin-inline: auto;
}

.frame__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 8px;
  border-right: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 179, 71, 0.12), rgba(51, 240, 206, 0.1));
}

.rail__switch {
  display: flex;
  gap: 4px;
}

.rail__label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: rgba(143, 166, 158, 0.7);
}

.chip {
  appearance: none;
  padding: 0.28em 0.5em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 31, 26, 0.55);
  color: var(--mist);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.chip:hover { color: var(--paper); border-color: var(--mist); }

.chip--legacy[aria-pressed="true"] {
  background: var(--amber);
  border-color: var(--amber);
  color: #1A1206;
}

.chip--new[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04201B;
}

.frame__main {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  min-height: 86px;
  padding: 12px clamp(14px, 3vw, 32px);
}

/* 品牌 */
.brand__link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(255, 179, 71, 0.2), var(--channel-soft));
  font-family: var(--serif);
  font-size: 20px;
  color: var(--channel);
  transition: border-color var(--ease), transform var(--ease);
}

.brand__link:hover .brand__mark {
  border-color: var(--channel);
  transform: translateX(4px);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.brand__sub {
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
  line-height: 1.5;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 0.5em 0.7em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--channel);
  transition: transform var(--ease), opacity var(--ease);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  margin-left: auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
}

.primary-nav__list a {
  position: relative;
  display: inline-block;
  padding: 0.35em 0;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--paper);
  transition: color var(--ease), transform var(--ease);
}

.primary-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line);
  transition: background var(--ease), height var(--ease);
}

.primary-nav__list a:hover {
  color: var(--channel);
  transform: translateX(2px);
}

.primary-nav__list a:hover::after { background: var(--channel); }

.primary-nav__list a[aria-current="page"] { color: var(--channel); }

.primary-nav__list a[aria-current="page"]::after {
  height: 2px;
  background: linear-gradient(90deg, var(--amber), var(--cyan));
}

.primary-nav__utility {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 20px);
  padding-left: clamp(10px, 2vw, 22px);
  border-left: 1px solid var(--line);
}

.util-link {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  border-bottom: 1px dotted var(--line);
  padding-bottom: 2px;
  transition: color var(--ease), border-color var(--ease);
}

.util-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.primary-nav .btn--cta { flex: none; }

/* 07 站点页脚 -------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background: var(--ink);
  border-top: 1px solid var(--line);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: linear-gradient(90deg, var(--amber), var(--cyan) 46%, var(--line));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 0.8fr) 1.5fr;
  gap: clamp(20px, 3vw, 44px);
  max-width: 1240px;
  margin-inline: auto;
  padding: clamp(34px, 5vw, 68px) var(--gutter);
}

.footer__mark {
  font-family: var(--display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.footer__tagline {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34ch;
}

.footer__channels {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer__channel {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.footer__dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
}

.footer__dot--legacy { background: var(--amber); }
.footer__dot--new {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(51, 240, 206, 0.16);
}

.footer__col-title {
  font-family: var(--serif);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer__links a {
  display: inline-block;
  padding: 0.25em 0;
  font-size: 14px;
  color: var(--paper);
  transition: color var(--ease), transform var(--ease);
}

.footer__links a:hover {
  color: var(--cyan);
  transform: translateX(4px);
}

.footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer__contact-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(143, 166, 158, 0.8);
}

.footer__contact-value {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--paper);
  word-break: break-word;
}

.footer__note {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 34ch;
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: 1240px;
  margin-inline: auto;
  padding: 16px var(--gutter) 22px;
  border-top: 1px solid var(--line);
}

.footer__legal {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  max-width: none;
}

.footer__note--base {
  margin-top: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(143, 166, 158, 0.72);
  max-width: none;
}

/* 08 响应式 ---------------------------------------------------------------- */
@media (max-width: 1180px) {
  .primary-nav__list a { font-size: 13.5px; }
  .util-link { font-size: 11px; }
  .footer__grid { grid-template-columns: 1.3fr repeat(3, 0.85fr); }
  .footer__contact { grid-column: 1 / -1; }
  .footer__note { max-width: 52ch; }
}

@media (max-width: 1100px) {
  .site-header { position: sticky; }

  .frame { grid-template-columns: 1fr; }

  .frame__rail {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 7px 14px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail__label { letter-spacing: 0.2em; }

  .frame__main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 10px 14px;
    min-height: 62px;
    padding: 10px 14px;
  }

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

  .primary-nav {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 8px 0 4px;
    padding-top: 10px;
    border-top: 1px solid var(--line);
    max-height: calc(100vh - 130px);
    overflow-y: auto;
  }

  .site-header[data-open] .primary-nav { display: flex; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav__list li { border-bottom: 1px solid rgba(29, 70, 59, 0.7); }

  .primary-nav__list a {
    display: block;
    padding: 0.72em 0;
    font-size: 15px;
  }

  .primary-nav__list a::after { display: none; }

  .primary-nav__list a[aria-current="page"] {
    color: var(--channel);
    border-left: 2px solid var(--channel);
    padding-left: 10px;
  }

  .primary-nav__utility {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-top: 14px;
    padding-left: 0;
    border-left: 0;
  }

  .util-link { font-size: 12px; padding-bottom: 3px; }

  .primary-nav .btn--cta {
    margin-top: 16px;
    width: 100%;
  }

  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__brand { grid-column: 1 / -1; }
  .footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  body { font-size: 15.5px; }

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

  .brand__mark { width: 36px; height: 36px; font-size: 18px; }
  .brand__name { font-size: 16px; }
  .brand__sub { font-size: 9.5px; letter-spacing: 0.12em; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .footer__base { flex-direction: column; align-items: flex-start; }

  .scorebar__inner { font-size: 10.5px; letter-spacing: 0.08em; }
}

@media (max-width: 400px) {
  .nav-toggle__text { display: none; }
  .brand__sub { display: none; }
}

/* 09 动效降级 -------------------------------------------------------------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

@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;
  }

  .pulse-dot {
    animation: none;
    box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.22);
  }

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

  .btn:hover,
  .footer__links a:hover,
  .primary-nav__list a:hover,
  .brand__link:hover .brand__mark { transform: none; }
}