/* ==========================================================================
   安博体育入口 — 共享站点样式 /assets/site.css
   结构：变量 → 重置 → 排版 → 通用组件 → 头部 → 页脚 → 响应式 → 动效偏好
   ========================================================================== */

/* 1. 设计变量 ------------------------------------------------------------- */
:root {
  --ink-900: #061426;
  --ink-700: #0B2745;
  --ink-500: #14456F;
  --lime: #B8FF3D;
  --lime-soft: #D7FF8A;
  --amber: #FFB020;
  --paper: #F5F1E6;
  --ink: #0A1017;
  --frost: #E8F2FF;
  --mist: #9BB0C6;
  --alert: #FF5D5D;

  --rail-w: 88px;
  --content: 1240px;
  --gutter: clamp(16px, 3.4vw, 40px);
  --radius: 4px;
  --speed: 200ms;
  --hairline: rgba(155, 176, 198, 0.28);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

/* 2. 重置 ----------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  background: var(--ink-900);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ink-900);
  color: var(--frost);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.68;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4, h5, h6, p, ul, ol, dl, figure, blockquote { margin: 0; }
ul[class], ol[class] { padding: 0; list-style: none; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

/* 3. 排版基础 ------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.sd-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--lime);
  text-transform: uppercase;
}
.sd-eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--amber);
}

.sd-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--frost);
}

.sd-lead {
  font-size: 16px;
  line-height: 1.72;
  color: var(--mist);
  max-width: 62ch;
}

.sd-prose {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--frost);
}
.sd-prose p + p { margin-top: 1em; }
.sd-prose ul,
.sd-prose ol { list-style: disc; padding-left: 1.35em; margin-top: 0.8em; }
.sd-prose li + li { margin-top: 0.35em; }
.sd-prose a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sd-note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-left: 2px solid var(--amber);
  padding: 2px 0 2px 12px;
}

.sd-section--paper .sd-title,
.sd-section--paper .sd-prose { color: var(--ink); }
.sd-section--paper .sd-lead,
.sd-section--paper .sd-note { color: #46566A; }
.sd-section--paper .sd-eyebrow { color: #2E6B00; }
.sd-section--paper .sd-eyebrow::before { background: var(--ink-500); }

/* 4. 焦点与无障碍 --------------------------------------------------------- */
:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 2px;
}

.sd-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--ink-900);
  font-weight: 800;
  font-size: 14px;
  text-decoration: none;
  border-radius: 0 0 4px 0;
}
.sd-skip:focus,
.sd-skip:focus-visible {
  left: 0;
  top: 0;
  outline-offset: 0;
}

#main-content { scroll-margin-top: 140px; }

/* 5. 通用骨架 ------------------------------------------------------------- */
.sd-container {
  width: 100%;
  max-width: var(--content);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.sd-section { padding: clamp(40px, 6vw, 80px) 0; }

.sd-section--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: 1px solid var(--ink-500);
  border-bottom: 1px solid var(--ink-500);
}

.sd-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}
.sd-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.sd-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.sd-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.sd-grid--7-5 > :first-child { grid-column: span 7; }
.sd-grid--7-5 > :last-child { grid-column: span 5; }

.sd-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 0;
  margin: 0 0 18px;
  list-style: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.sd-breadcrumb li { display: flex; align-items: center; gap: 6px; }
.sd-breadcrumb li::after { content: "/"; color: var(--ink-500); }
.sd-breadcrumb li:last-child::after { content: ""; }
.sd-breadcrumb a { color: var(--mist); text-decoration: none; }
.sd-breadcrumb a:hover { color: var(--lime); }

.sd-section--paper .sd-breadcrumb,
.sd-section--paper .sd-breadcrumb a { color: #5B6B7E; }
.sd-section--paper .sd-breadcrumb a:hover { color: var(--ink); }
.sd-section--paper .sd-breadcrumb li::after { color: rgba(10, 16, 23, 0.3); }

/* 6. 框景与图片容器 ------------------------------------------------------- */
.sd-frame {
  position: relative;
  border: 1px solid var(--ink-500);
  padding: clamp(20px, 3vw, 36px);
  background:
    linear-gradient(180deg, rgba(11, 39, 69, 0.55), rgba(6, 20, 38, 0.2));
}
.sd-frame::before {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  background:
    linear-gradient(var(--lime), var(--lime)) 0 0 / 16px 2px no-repeat,
    linear-gradient(var(--lime), var(--lime)) 0 0 / 2px 16px no-repeat,
    linear-gradient(var(--amber), var(--amber)) 100% 0 / 16px 2px no-repeat,
    linear-gradient(var(--amber), var(--amber)) 100% 0 / 2px 16px no-repeat,
    linear-gradient(var(--amber), var(--amber)) 0 100% / 16px 2px no-repeat,
    linear-gradient(var(--amber), var(--amber)) 0 100% / 2px 16px no-repeat,
    linear-gradient(var(--lime), var(--lime)) 100% 100% / 16px 2px no-repeat,
    linear-gradient(var(--lime), var(--lime)) 100% 100% / 2px 16px no-repeat;
}
.sd-section--paper .sd-frame {
  border-color: rgba(10, 16, 23, 0.24);
  background: rgba(255, 255, 255, 0.5);
}

.sd-media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--ink-500);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 18% 8%, rgba(184, 255, 61, 0.22), transparent 58%),
    linear-gradient(135deg, var(--ink-500), var(--ink-900));
}
.sd-media--4x5 { aspect-ratio: 4 / 5; }
.sd-media--1x1 { aspect-ratio: 1 / 1; }
.sd-media--21x9 { aspect-ratio: 21 / 9; }
.sd-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.sd-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(232, 242, 255, 0.08);
}

/* 7. 按钮 / 标签 / 卡片 --------------------------------------------------- */
.sd-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform var(--speed) ease-out,
    background-color var(--speed) ease-out,
    color var(--speed) ease-out,
    border-color var(--speed) ease-out;
}
.sd-btn--lime { background: var(--lime); color: var(--ink-900); }
.sd-btn--lime:hover { background: var(--lime-soft); transform: translateY(-2px); }
.sd-btn--amber { background: var(--amber); color: var(--ink); }
.sd-btn--amber:hover { background: #FFC55A; transform: translateY(-2px); }
.sd-btn--ghost {
  background: transparent;
  color: var(--frost);
  border-color: var(--ink-500);
}
.sd-btn--ghost:hover {
  color: var(--amber);
  border-color: var(--amber);
  transform: translateY(-2px);
}
.sd-section--paper .sd-btn--ghost {
  color: var(--ink);
  border-color: rgba(10, 16, 23, 0.35);
}
.sd-section--paper .sd-btn--ghost:hover {
  color: #8A5A00;
  border-color: var(--ink-500);
}

.sd-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 2px;
  border: 1px solid rgba(6, 20, 38, 0.22);
  background: var(--lime-soft);
  color: var(--ink-900);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.06em;
}
.sd-tag--amber { background: var(--amber); border-color: running; border-color: rgba(6, 20, 38, 0.22); color: var(--ink); }
.sd-tag--outline {
  background: transparent;
  border-color: var(--lime);
  color: var(--lime);
}

.sd-card {
  position: relative;
  padding: 20px;
  background: var(--ink-700);
  border: 1px solid var(--ink-500);
  border-radius: var(--radius);
  transition:
    transform var(--speed) ease-out,
    border-color var(--speed) ease-out,
    background-color var(--speed) ease-out;
}
.sd-card:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
}

.sd-section--paper .sd-card {
  background: #FFFDF6;
  border-color: rgba(10, 16, 23, 0.18);
  color: var(--ink);
}

/* 8. 头部 ----------------------------------------------------------------- */
.sd-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 90;
  background: rgba(6, 20, 38, 0.65);
  pointer-events: none;
}
.sd-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime), var(--amber));
  transition: transform 120ms linear;
}

.sd-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, #061426 0%, #0B2745 100%);
  border-bottom: 1px solid var(--ink-500);
}

/* 左侧品牌轨道 */
.sd-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-w);
  z-index: 70;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 24px;
  background: linear-gradient(180deg, #061426 0%, #0B2745 52%, #061426 100%);
  border-right: 1px solid var(--ink-500);
}
.sd-rail__stamp {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  background: var(--lime);
  padding: 6px 8px;
  transform: skewX(-8deg);
  border-radius: 2px;
}
.sd-rail__ticks {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
}
.sd-rail__ticks span {
  display: block;
  width: 16px;
  height: 1px;
  background: rgba(155, 176, 198, 0.45);
}
.sd-rail__ticks span:nth-child(3n) {
  width: 30px;
  background: var(--lime);
}
.sd-rail__ticks span:nth-child(4n) {
  background: var(--amber);
  width: 22px;
}
.sd-rail__word {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.38em;
  color: var(--mist);
}

/* 顶部三栏信息条 */
.sd-topbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  max-width: var(--content);
  margin: 0 auto;
  padding: 8px var(--gutter);
  border-bottom: 1px dashed var(--hairline);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.sd-topbar__note { font-weight: 600; }
.sd-topbar__tag {
  justify-self: center;
  color: var(--lime-soft);
  font-weight: 700;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.sd-topbar__ios {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border-radius: 999px;
  background: var(--lime);
  color: var(--ink-900);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background-color var(--speed) ease-out, transform var(--speed) ease-out;
}
.sd-topbar__ios::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-900);
}
.sd-topbar__ios:hover {
  background: var(--lime-soft);
  transform: translateY(-1px);
}

/* 刊头 */
.sd-masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  max-width: var(--content);
  margin: 0 auto;
  padding: 14px var(--gutter) 12px;
}
.sd-brand {
  grid-column: 2;
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--frost);
}
.sd-brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 2px;
  background: var(--lime);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 18px;
  line-height: 1;
  transform: skewX(-8deg);
}
.sd-brand__stack { display: flex; flex-direction: column; line-height: 1; }
.sd-brand__name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(21px, 3.4vw, 27px);
  letter-spacing: -0.02em;
  color: var(--frost);
}
.sd-brand__kicker {
  margin-top: 5px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--amber);
  text-transform: uppercase;
}
.sd-brand:hover .sd-brand__name { color: var(--lime); }

/* 移动导航按钮 */
.sd-nav-toggle {
  grid-column: 3;
  justify-self: end;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--lime);
  border-radius: 999px;
  background: transparent;
  color: var(--lime);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color var(--speed) ease-out, color var(--speed) ease-out;
}
.sd-nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.sd-nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
}
.sd-nav-toggle:hover { background: rgba(184, 255, 61, 0.14); }

/* 主导航 */
.sd-nav {
  border-top: 1px solid rgba(20, 69, 111, 0.85);
  background: rgba(6, 20, 38, 0.72);
}
.sd-nav__inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.sd-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.sd-nav__item { display: block; }
.sd-nav__link {
  display: block;
  padding: 12px 16px;
  border-bottom: 2px solid transparent;
  color: var(--frost);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition:
    color var(--speed) ease-out,
    border-color var(--speed) ease-out,
    background-color var(--speed) ease-out;
}
.sd-nav__link:hover {
  color: var(--lime);
  border-bottom-color: var(--amber);
  background: rgba(255, 176, 32, 0.08);
}
.sd-nav__link[aria-current="page"] {
  color: var(--lime);
  border-bottom-color: var(--lime);
  background: rgba(184, 255, 61, 0.09);
}

/* 9. 页脚 ----------------------------------------------------------------- */
.sd-footer {
  margin-top: clamp(40px, 6vw, 72px);
  padding-top: clamp(36px, 5vw, 64px);
  background:
    radial-gradient(90% 60% at 85% 0%, rgba(20, 69, 111, 0.55), transparent 62%),
    var(--ink-900);
  border-top: 3px solid var(--lime);
  color: var(--frost);
}
.sd-footer__inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(28px, 4vw, 56px);
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(28px, 4vw, 44px);
}
.sd-footer__word {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--frost);
}
.sd-footer__summary {
  margin: 12px 0 20px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}
.sd-footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.sd-footer__title {
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--hairline);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--lime);
}
.sd-footer__list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}
.sd-footer__list li + li { margin-top: 8px; }
.sd-footer__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--frost);
  text-decoration: none;
  transition: color var(--speed) ease-out;
}
.sd-footer__list a::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--ink-500);
  transition: background-color var(--speed) ease-out;
}
.sd-footer__list a:hover { color: var(--lime); }
.sd-footer__list a:hover::before { background: var(--amber); }

.sd-footer__contact {
  max-width: var(--content);
  margin: 0 auto;
  padding: 24px var(--gutter);
  border-top: 1px dashed var(--hairline);
  border-bottom: 1px solid rgba(20, 69, 111, 0.7);
}
.sd-footer__contacts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 10px 32px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}
.sd-footer__contacts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}
.sd-footer__label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.sd-footer__value { color: var(--frost); }
.sd-footer__value--code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
}
.sd-footer__copy {
  padding: 2px 9px;
  border: 1px solid var(--ink-500);
  border-radius: 999px;
  background: transparent;
  color: var(--lime);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color var(--speed) ease-out, border-color var(--speed) ease-out;
}
.sd-footer__copy:hover {
  background: rgba(184, 255, 61, 0.14);
  border-color: var(--lime);
}
.sd-footer__feedback {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.sd-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--content);
  margin: 0 auto;
  padding: 18px var(--gutter) 24px;
}
.sd-footer__copyright {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}
.sd-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12.5px;
}
.sd-footer__legal-links a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--speed) ease-out;
}
.sd-footer__legal-links a:hover { color: var(--lime); }

/* 10. 响应式 -------------------------------------------------------------- */
@media (min-width: 1100px) {
  body { padding-left: var(--rail-w); }
  .sd-rail { display: flex; }
  .sd-progress { left: var(--rail-w); }
}

@media (max-width: 980px) {
  .sd-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sd-grid--7-5 > :first-child,
  .sd-grid--7-5 > :last-child { grid-column: 1 / -1; }
  .sd-footer__inner { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .sd-masthead { grid-template-columns: 1fr auto; }
  .sd-brand { grid-column: 1; justify-self: start; }
  .sd-nav-toggle { display: inline-flex; }

  .sd-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 240ms ease-out;
  }
  .sd-header[data-open] .sd-nav { max-height: 34rem; }

  .sd-nav__inner { padding: 0 var(--gutter); }
  .sd-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 14px;
  }
  .sd-nav__link {
    padding: 13px 14px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }
  .sd-nav__link:hover {
    border-bottom-color: transparent;
    border-left-color: var(--amber);
  }
  .sd-nav__link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--lime);
  }
  .sd-header[data-open] .sd-nav-toggle {
    background: var(--lime);
    color: var(--ink-900);
  }
  .sd-header[data-open] .sd-nav-toggle__text::after { content: ""; }

  .sd-topbar { grid-template-columns: 1fr auto; }
  .sd-topbar__tag { display: none; }

  .sd-grid,
  .sd-grid--2,
  .sd-grid--3 { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { font-size: 15px; }
  .sd-topbar { padding: 7px var(--gutter); }
  .sd-topbar__note { display: none; }
  .sd-topbar { grid-template-columns: 1fr; justify-items: end; }
  .sd-grid--4 { grid-template-columns: 1fr; }
  .sd-footer__cols { grid-template-columns: 1fr 1fr; }
  .sd-footer__legal { flex-direction: column; align-items: flex-start; }
  .sd-frame { padding: 18px; }
}

/* 11. 动效偏好 ------------------------------------------------------------ */
@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;
  }
  .sd-card:hover,
  .sd-btn:hover,
  .sd-topbar__ios:hover { transform: none; }
  .sd-progress__bar { transition: none; }
}