/* ==========================================================================
   8手机官方3 · 共享站点样式  /assets/site.css
   母题：堆叠面板 · 双层控制台导航 · 矿物索引色系
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --navy: #0B2A4A;
  --night: #061B33;
  --signal: #FF6A2B;
  --mint: #7FD8D4;
  --mist: #F4F7F8;
  --rock: #6B7578;
  --moss: #5F7A61;
  --clay: #B86B4B;
  --cream: #F1E9DC;

  /* 语义色 */
  --ink: #0B2A4A;
  --ink-soft: #3D5771;
  --ink-mute: #6B7578;
  --line: rgba(11, 42, 74, 0.12);
  --line-strong: rgba(11, 42, 74, 0.22);
  --on-dark: rgba(244, 247, 248, 0.72);
  --on-dark-strong: #F4F7F8;

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

  /* 形状 */
  --radius-xl: 34px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;

  /* 尺度 */
  --shell: 1180px;
  --gutter: clamp(18px, 4vw, 46px);

  /* 阴影与动效 */
  --shadow-panel: 0 34px 66px -50px rgba(6, 27, 51, 0.9);
  --shadow-card: 0 20px 38px -32px rgba(6, 27, 51, 0.82);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

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

body {
  margin: 0;
  background-color: var(--mist);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--navy);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h3 { font-size: clamp(1.15rem, 1.9vw, 1.4rem); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

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

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

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

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

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

::selection {
  background: var(--signal);
  color: var(--night);
}

/* ---------- 3. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--signal);
}

.visually-hidden {
  position: absolute !important;
  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;
}

#main-content { scroll-margin-top: 134px; }

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

.container { display: block; }

.stack > * + * { margin-top: clamp(18px, 2.6vw, 32px); }

/* ---------- 5. 跳过导航 ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: clamp(14px, 4vw, 34px);
  z-index: 400;
  display: inline-block;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  background: var(--signal);
  color: var(--night);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 12px 28px -18px rgba(0, 0, 0, 0.8);
  transition: top 0.22s var(--ease);
}
.skip-link:focus {
  top: 14px;
}

/* ---------- 6. 头部：双层信息导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  color: var(--on-dark-strong);
  background: var(--night);
  border-bottom: 1px solid rgba(127, 216, 212, 0.16);
  isolation: isolate;
}

.header-bar {
  background:
    radial-gradient(120% 220% at 8% -60%, rgba(127, 216, 212, 0.16), transparent 58%),
    var(--night);
}

.header-top {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 40px);
  padding-block: 12px;
}

/* 品牌铭牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  border-radius: var(--radius-md);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border-radius: 14px;
  background: var(--signal);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  box-shadow: inset 0 -3px 0 rgba(6, 27, 51, 0.28);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.brand-name {
  color: var(--mist);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.brand-line {
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.4;
  white-space: nowrap;
}

/* 工具区 */
.header-utility {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 22px);
  margin-left: auto;
}

.util-link {
  position: relative;
  padding: 6px 2px;
  color: rgba(244, 247, 248, 0.68);
  font-size: 13.5px;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.util-link:hover,
.util-link:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.18s var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn-signal {
  background: var(--signal);
  color: var(--night);
  box-shadow: 0 14px 26px -20px rgba(255, 106, 43, 0.95);
}
.btn-signal:hover { background: #FF8351; }

.btn-ghost {
  background: transparent;
  color: var(--mint);
  border-color: rgba(127, 216, 212, 0.45);
}
.btn-ghost:hover {
  background: rgba(127, 216, 212, 0.12);
  border-color: var(--mint);
}

.btn-primary {
  background: var(--navy);
  color: var(--mist);
}
.btn-primary:hover { background: #123A63; }

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--line-strong);
}
.btn-outline:hover {
  background: rgba(11, 42, 74, 0.06);
  border-color: var(--navy);
}

/* ---------- 8. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 16px;
  border: 1px solid rgba(127, 216, 212, 0.35);
  border-radius: var(--radius-pill);
  background: rgba(127, 216, 212, 0.08);
  color: var(--mist);
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease),
    color 0.2s var(--ease);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 16px;
  height: 12px;
}
.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--mint);
  transform-origin: center;
  transition: transform 0.24s var(--ease), opacity 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.nav-toggle-label {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.nav-toggle[aria-expanded="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--night);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span { background: var(--night); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0.3);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 9. 主导航带 ---------- */
.header-nav {
  background-color: var(--navy);
  border-top: 1px solid rgba(127, 216, 212, 0.14);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  padding-block: 7px;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 15px 12px;
  border-radius: var(--radius-pill);
  color: rgba(244, 247, 248, 0.66);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 5px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--signal);
  transform: translateX(-50%);
  transition: width 0.24s var(--ease);
}

.nav-link:hover {
  color: var(--mist);
  background: rgba(127, 216, 212, 0.1);
}
.nav-link:hover::after { width: 13px; }

.nav-link[aria-current="page"] {
  color: var(--mist);
  background: rgba(127, 216, 212, 0.14);
}
.nav-link[aria-current="page"]::after { width: 19px; }

/* ---------- 10. 滚动进度光带 ---------- */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(127, 216, 212, 0.1);
  pointer-events: none;
  overflow: hidden;
}
.scroll-meter-fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--mint) 0%, var(--signal) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.14s linear;
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 112px);
  padding-block: clamp(40px, 6vw, 74px) 26px;
  background:
    radial-gradient(90% 140% at 88% -20%, rgba(127, 216, 212, 0.14), transparent 62%),
    var(--night);
  color: var(--on-dark);
  border-top: 1px solid rgba(127, 216, 212, 0.16);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.95fr);
  gap: clamp(28px, 5vw, 68px);
  padding-bottom: clamp(26px, 4vw, 44px);
  border-bottom: 1px solid rgba(127, 216, 212, 0.14);
}

.footer-wordmark {
  display: inline-block;
  color: var(--mist);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.footer-wordmark:hover {
  color: var(--mint);
  border-bottom-color: var(--signal);
}

.footer-summary {
  max-width: 32ch;
  margin: 12px 0 20px;
  color: rgba(244, 247, 248, 0.62);
  font-size: 14.5px;
  line-height: 1.8;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 40px);
}

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

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 15px;
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.4;
}
.footer-col-title::before {
  content: "";
  width: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--signal);
  flex: 0 0 auto;
}

.footer-links li + li { margin-top: 10px; }

.footer-link {
  display: inline-block;
  color: rgba(244, 247, 248, 0.78);
  font-size: 14.5px;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(18px, 3vw, 38px);
  padding-block: clamp(18px, 2.6vw, 26px);
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244, 247, 248, 0.6);
}

.footer-contact-item {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  min-width: 0;
  word-break: break-word;
}

.footer-contact-label {
  flex: 0 0 auto;
  padding: 1px 8px;
  border-radius: var(--radius-pill);
  background: rgba(127, 216, 212, 0.14);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 18px;
  border-top: 1px solid rgba(127, 216, 212, 0.12);
  color: rgba(244, 247, 248, 0.42);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer-copy,
.footer-icp { display: inline-block; }

/* ---------- 12. 面包屑 ---------- */
.breadcrumbs {
  padding-block: clamp(14px, 2vw, 22px);
  font-size: 13px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--rock);
}

.breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list li + li::before {
  content: "/";
  color: rgba(107, 117, 120, 0.5);
  font-family: var(--font-mono);
}

.breadcrumb-link {
  color: var(--rock);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.breadcrumb-link:hover {
  color: var(--navy);
  border-bottom-color: var(--navy);
}

.breadcrumb-current {
  color: var(--navy);
  font-weight: 700;
}

/* ---------- 13. 面板 / 章节元件 ---------- */
.panel {
  padding: clamp(20px, 3.4vw, 40px);
  border-radius: var(--radius-xl);
  background: var(--cream);
  color: var(--ink);
  box-shadow: var(--shadow-panel);
}
.panel--dark {
  background: var(--navy);
  color: var(--on-dark);
}
.panel--dark h1,
.panel--dark h2,
.panel--dark h3 { color: var(--mist); }
.panel--mist { background: var(--mist); }
.panel--mint { background: rgba(127, 216, 212, 0.18); }
.panel--cream { background: var(--cream); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--clay);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.5;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  flex: 0 0 auto;
}

.section-number {
  display: block;
  color: var(--clay);
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat-figure {
  display: block;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: clamp(4rem, 10vw, 9rem);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 60ch;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.75;
}

.divider {
  height: 2px;
  border: 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--clay), rgba(184, 107, 75, 0));
}

/* ---------- 14. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(11, 42, 74, 0.07);
  color: var(--navy);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.6;
  white-space: nowrap;
}
.tag--signal { background: var(--signal); color: var(--night); }
.tag--mint { background: rgba(127, 216, 212, 0.26); color: var(--navy); }
.tag--clay { background: rgba(184, 107, 75, 0.16); color: #94502F; }
.tag--moss { background: rgba(95, 122, 97, 0.16); color: var(--moss); }
.tag--outline {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
}

/* ---------- 15. 行内行动链接 ---------- */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--navy);
  font-weight: 700;
  border-bottom: 2px solid rgba(127, 216, 212, 0.6);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.22s var(--ease);
}
.link-arrow:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- 16. 长文排版 ---------- */
.prose {
  max-width: 72ch;
  font-size: clamp(16px, 1.05vw, 17.5px);
  line-height: 1.85;
  color: var(--ink);
}
.prose > :first-child { margin-top: 0; }
.prose h2 {
  margin: 1.9em 0 0.6em;
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
}
.prose h3 {
  margin: 1.6em 0 0.5em;
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
}
.prose ul,
.prose ol {
  margin: 0 0 1em;
  padding-left: 1.35em;
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.45em; }
.prose li::marker { color: var(--clay); }
.prose a {
  color: var(--navy);
  border-bottom: 2px solid rgba(127, 216, 212, 0.7);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.prose a:hover { color: var(--signal); border-bottom-color: var(--signal); }
.prose blockquote {
  margin: 1.4em 0;
  padding: 16px 22px;
  border-left: 3px solid var(--signal);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--cream);
  color: var(--ink);
}
.prose code {
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(11, 42, 74, 0.07);
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
}
.prose hr {
  margin: 2em 0;
  border-top: 1px solid var(--line);
}

/* ---------- 17. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 18. 图片容器基础 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  background-color: var(--night);
  background-image:
    linear-gradient(135deg, rgba(11, 42, 74, 0.94), rgba(6, 27, 51, 0.98)),
    repeating-linear-gradient(90deg, rgba(127, 216, 212, 0.16) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(0deg, rgba(127, 216, 212, 0.1) 0 1px, transparent 1px 32px);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-figure {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
}

.media-caption {
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.7;
}

/* ---------- 19. 显现动效 ---------- */
[data-reveal] {
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
[data-reveal].is-pending {
  opacity: 0;
  transform: translateY(14px);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 20. 响应式 ---------- */
@media (max-width: 1040px) {
  #main-content { scroll-margin-top: 86px; }

  .header-utility { display: none; }
  .nav-toggle { display: inline-flex; }

  .header-nav {
    display: none;
    border-top: 1px solid rgba(127, 216, 212, 0.16);
  }
  .header-nav[data-open] {
    display: block;
    animation: navReveal 0.28s var(--ease) both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    gap: 6px;
    padding-block: 14px 18px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 13px 16px;
    border-radius: var(--radius-md);
    background: rgba(127, 216, 212, 0.06);
    color: rgba(244, 247, 248, 0.82);
    font-size: 15px;
  }
  .nav-link::after { display: none; }
  .nav-link:hover { background: rgba(127, 216, 212, 0.13); }
  .nav-link[aria-current="page"] {
    background: rgba(255, 106, 43, 0.16);
    color: var(--mist);
    box-shadow: inset 3px 0 0 var(--signal);
  }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
  }
  .footer-summary { max-width: 46ch; }
}

@keyframes navReveal {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 720px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .footer-meta { flex-direction: column; align-items: flex-start; gap: 6px; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .brand-mark { width: 40px; height: 40px; border-radius: 12px; font-size: 20px; }
  .brand-line { font-size: 10.5px; letter-spacing: 0.04em; }
  .brand-name { font-size: 15px; }
  .btn { padding: 10px 17px; font-size: 13.5px; }
  .grid-2,
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .panel { border-radius: var(--radius-lg); }
  .scroll-meter { height: 2px; }
}

@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;
  }
  [data-reveal],
  [data-reveal].is-pending {
    opacity: 1;
    transform: none;
  }
  .scroll-meter-fill { transition: none; }
  .header-nav[data-open] { animation: none; }
}

/* ---------- 21. 打印 ---------- */
@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .scroll-meter { display: none !important; }
  body { background: #FFFFFF; color: #000000; }
  .panel { box-shadow: none; border: 1px solid #CCCCCC; }
  .prose { max-width: none; }
  a { text-decoration: underline; }
}