/* ============================================================
   星空体育中文站 · 共享站点样式表  /assets/site.css
   基础重置 / 变量 / 排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption,
blockquote, dl, dt, dd { margin: 0; padding: 0; }

ul, ol { list-style: none; }

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --star: #0A1230;
  --star-deep: #131E44;
  --cream: #F4EAD7;
  --ink: #2A2118;
  --amber: #F0A63C;
  --cyan: #3BE8D0;
  --signal: #E2571E;
  --mist: #9FB4D6;
  --glow: #CFF7EE;
  --gold-line: #7A5A28;

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-num: "JetBrains Mono", "SFMono-Regular", "Roboto Mono", ui-monospace, Menlo, Consolas, monospace;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --shadow-hard: 6px 6px 0 0 var(--ink);
  --shadow-glow: 6px 6px 0 0 rgba(59, 232, 208, 0.22);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 180ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--star);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
}

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 1px;
}

::selection {
  background: var(--amber);
  color: var(--ink);
}

/* ---------- 4. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -160%);
  padding: 11px 24px;
  background: var(--amber);
  color: var(--ink);
  border: 2px solid var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translate(-50%, 0); }

/* ---------- 5. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--star);
  border-bottom: 2px solid rgba(59, 232, 208, 0.32);
}

/* 5.1 状态细条 */
.status-strip {
  position: relative;
  background: var(--star-deep);
  border-bottom: 1px solid rgba(159, 180, 214, 0.2);
}
.status-strip__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 8px var(--gutter);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  animation: statusPulse 2.6s var(--ease) infinite;
}
@keyframes statusPulse {
  0%   { box-shadow: 0 0 0 0 rgba(59, 232, 208, 0.55); }
  70%  { box-shadow: 0 0 0 9px rgba(59, 232, 208, 0); }
  100% { box-shadow: 0 0 0 0 rgba(59, 232, 208, 0); }
}
.status-strip__label { color: var(--cyan); }
.status-strip__value { color: var(--cream); letter-spacing: 0.06em; }
.status-strip__sep {
  width: 1px;
  height: 12px;
  background: rgba(159, 180, 214, 0.45);
}
.status-strip__meta b {
  color: var(--amber);
  font-weight: 700;
}

/* 5.2 滚动进度星轨 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(159, 180, 214, 0.14);
  overflow: hidden;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--amber) 55%, var(--signal));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* 5.3 品牌 + 栏目左右分置 */
.header-bar {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 13px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  min-width: 0;
}
.brand__mark {
  flex: none;
  width: 36px;
  height: 36px;
  color: var(--cyan);
  transition: transform 320ms var(--ease);
}
.brand__mark svg { width: 100%; height: 100%; }
.brand:hover .brand__mark { transform: rotate(52deg); }
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: 0.08em;
  color: var(--cream);
}
.brand__sub {
  margin-top: 4px;
  font-family: var(--font-num);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

/* 5.4 移动端折叠按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 2px solid var(--mist);
  color: var(--cream);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bars {
  position: relative;
  flex: none;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after  { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after  { top: 0; transform: rotate(-45deg); }
.nav-toggle__text { line-height: 1; }

/* 5.5 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 30px);
  min-width: 0;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 24px);
}
.site-nav__list a {
  position: relative;
  display: block;
  padding: 7px 1px 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cream);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}
.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--signal));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease);
}
.site-nav__list a:hover,
.site-nav__list a:focus-visible { color: var(--cyan); }
.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after { transform: scaleX(1); }
.site-nav__list a[aria-current="page"] { color: var(--cyan); }
.site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: clamp(14px, 2vw, 26px);
  border-left: 1px solid rgba(159, 180, 214, 0.28);
}

/* ---------- 6. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 2px solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  box-shadow: 4px 4px 0 0 var(--ink);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 0 var(--ink); }

.btn--primary {
  background: var(--amber);
  color: var(--ink);
  border-color: var(--ink);
}
.btn--ghost {
  background: transparent;
  color: var(--cream);
  border-color: var(--mist);
  box-shadow: none;
}
.btn--ghost:hover {
  background: var(--cyan);
  color: var(--star);
  border-color: var(--cyan);
  box-shadow: 4px 4px 0 0 rgba(59, 232, 208, 0.28);
}
.btn--sm {
  padding: 9px 16px;
  font-size: 13px;
  box-shadow: 3px 3px 0 0 var(--ink);
}
.btn--sm.btn--ghost { box-shadow: none; }

/* ---------- 7. 布局容器与章节 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.wrap--narrow { max-width: 920px; }
.wrap--wide { max-width: 1440px; }

.section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}
.section--tight { padding: clamp(28px, 4vw, 52px) 0; }
.section--cream { background: var(--cream); color: var(--ink); }
.section--deep { background: var(--star-deep); }
.section > * { position: relative; z-index: 1; }

.section--grid::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(159, 180, 214, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159, 180, 214, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
}
.section--cream.section--grid::before {
  background-image:
    linear-gradient(rgba(42, 33, 24, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 33, 24, 0.07) 1px, transparent 1px);
}

/* ---------- 8. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 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)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--sidebar { grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); }

/* ---------- 9. 标题与数字 ---------- */
.display-1, .display-2, .display-3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.display-1 { font-size: clamp(38px, 7.2vw, 72px); }
.display-2 { font-size: clamp(30px, 5vw, 56px); }
.display-3 { font-size: clamp(24px, 3.4vw, 40px); }

.heading-lg {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.heading-md {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.35;
}
.heading-sm {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.num-lg {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 48px);
  line-height: 1;
}
.num-xl {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1;
  letter-spacing: -0.01em;
}
.chapter-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1;
  color: var(--signal);
  letter-spacing: -0.02em;
}

/* ---------- 10. 注释 / 标签 / 正文 ---------- */
.annot {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}
.annot--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.2em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border: 1px solid currentColor;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.5;
}
.tag--cyan { color: var(--cyan); }
.tag--amber { color: var(--amber); }
.tag--signal { color: var(--signal); }
.tag--ink { color: var(--ink); border-color: var(--gold-line); }

.prose {
  max-width: 38em;
  font-size: 17px;
  line-height: 1.75;
}
.prose p + p { margin-top: 1.05em; }
.prose a {
  color: var(--signal);
  border-bottom: 1px solid currentColor;
}
.prose--on-dark a { color: var(--cyan); }
.prose strong { font-weight: 700; }

.rule {
  height: 1px;
  border: 0;
  background: var(--gold-line);
  opacity: 0.5;
}
.rule--dark { background: rgba(159, 180, 214, 0.28); opacity: 1; }

/* ---------- 11. 硬边卡片 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  border: 2px solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  box-shadow: var(--shadow-hard);
}
.panel--dark {
  background: var(--star-deep);
  color: var(--cream);
  border-color: var(--cyan);
  box-shadow: var(--shadow-glow);
}
.panel--amber {
  background: var(--amber);
  color: var(--ink);
  border-color: var(--ink);
}
.panel--flush { padding: 0; }

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  padding: 14px 0;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li::after {
  content: "/";
  margin: 0 9px;
  color: rgba(159, 180, 214, 0.5);
}
.breadcrumb li:last-child::after { content: ""; margin: 0; }
.breadcrumb a {
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--cream); }

.breadcrumb--on-cream { color: var(--gold-line); }
.breadcrumb--on-cream a { color: var(--gold-line); }
.breadcrumb--on-cream a:hover { color: var(--signal); }
.breadcrumb--on-cream li::after { color: rgba(122, 90, 40, 0.5); }
.breadcrumb--on-cream [aria-current="page"] { color: var(--ink); }

/* ---------- 13. 图片 / 星图容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: linear-gradient(140deg, var(--star-deep), var(--star));
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}
.media-frame--on-dark {
  border-color: var(--cyan);
  box-shadow: var(--shadow-glow);
}
.media-frame > img,
.media-frame > video,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--3x2  { aspect-ratio: 3 / 2; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--1x1  { aspect-ratio: 1 / 1; }
.media-frame--3x4  { aspect-ratio: 3 / 4; }

.media-frame--placeholder {
  background-image:
    linear-gradient(rgba(159, 180, 214, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159, 180, 214, 0.1) 1px, transparent 1px);
  background-size: 32px 32px;
}
.media-frame__slot {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(159, 180, 214, 0.75);
}
.media-frame__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--star);
  color: var(--cream);
  border-top: 2px solid rgba(59, 232, 208, 0.32);
}
.footer__stars {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 130px;
  opacity: 0.6;
  pointer-events: none;
}
.footer__stars svg { width: 100%; height: 100%; }

.footer__inner {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 80px) var(--gutter) clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.6fr) minmax(0, 1.15fr);
  gap: clamp(28px, 4vw, 56px);
}

.footer__brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: 0.1em;
}
.footer__brand-sub {
  margin-top: 10px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.footer__site-note {
  margin-top: 16px;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 32px);
}
.footer__col-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(159, 180, 214, 0.25);
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer__col a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.footer__col a:hover { color: var(--cyan); padding-left: 6px; }
.footer__col a[aria-current="page"] { color: var(--cyan); }

.footer__contact-line {
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.7;
}
.footer__contact-line b {
  display: block;
  margin-top: 3px;
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--cream);
  overflow-wrap: anywhere;
}
.footer__contact-note {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(159, 180, 214, 0.85);
}

.footer__base {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--gutter) 36px;
  border-top: 1px solid rgba(159, 180, 214, 0.2);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 28px;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--mist);
}
.footer__legal { max-width: 60em; }
.footer__copy { white-space: nowrap; }

/* ---------- 15. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1180px) {
  .site-nav__list a { font-size: 14px; letter-spacing: 0.03em; }
}

@media (max-width: 1000px) {
  .nav-toggle { display: inline-flex; position: relative; z-index: 90; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 80;
    width: min(350px, 88vw);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 84px 26px 48px;
    overflow-y: auto;
    background: var(--star-deep);
    border-left: 2px solid rgba(59, 232, 208, 0.5);
    box-shadow: -12px 0 44px rgba(0, 0, 0, 0.45);
    transform: translateX(102%);
    transition: transform 300ms var(--ease);
  }
  .site-nav[data-open] { transform: translateX(0); }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav__item + .site-nav__item {
    border-top: 1px solid rgba(159, 180, 214, 0.16);
  }
  .site-nav__list a {
    padding: 15px 4px;
    font-size: 17px;
  }
  .site-nav__list a::after { display: none; }

  .site-nav__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    margin-top: 26px;
    padding: 26px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(159, 180, 214, 0.22);
  }
  .site-nav__actions .btn {
    width: 100%;
    padding: 13px 18px;
    font-size: 15px;
  }
  .site-nav__actions .btn--ghost { box-shadow: none; }
  .site-nav__actions .btn--primary { box-shadow: 3px 3px 0 0 rgba(240, 166, 60, 0.35); }

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

  .footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .status-strip__meta--sm { display: none; }
  .header-bar { padding: 11px var(--gutter); }
  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .media-frame { box-shadow: 4px 4px 0 0 var(--ink); }
  .media-frame--on-dark { box-shadow: 4px 4px 0 0 rgba(59, 232, 208, 0.22); }

  .footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer__base { flex-direction: column; }

  .btn { width: auto; }
}

@media (max-width: 520px) {
  .status-strip__inner {
    gap: 6px 10px;
    font-size: 10px;
    letter-spacing: 0.08em;
  }
  .status-strip__sep { display: none; }
  .brand__mark { width: 30px; height: 30px; }
  .brand__name { font-size: 17px; letter-spacing: 0.05em; }
  .brand__sub { display: none; }
  .nav-toggle { padding: 8px 12px; font-size: 11px; letter-spacing: 0.1em; }
  .footer__copy { white-space: normal; }
}

/* ---------- 17. 减少动态 ---------- */
@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;
  }
  .brand:hover .brand__mark { transform: none; }
  .btn:hover { transform: none; }
}