/* ============================================================
   火博看台 · 共享样式 /assets/site.css
   结构：reset → 变量 → 基础排版 → 通用组件 → 头部 → 页脚 → 响应式
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

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

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

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

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

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

/* ---------- 变量 ---------- */
:root {
  --flame: #D23B22;
  --flame-deep: #A92B16;
  --flame-soft: rgba(210, 59, 34, 0.08);
  --ink: #151719;
  --ink-2: #2A2F33;
  --paper: #FBF8F2;
  --cold: #E8ECEE;
  --teal: #3F7C8A;
  --teal-deep: #23515C;
  --amber: #E9A23B;
  --haze: #D8E5E7;
  --line: #C9D0D4;
  --line-soft: rgba(201, 208, 212, 0.72);
  --green: #2E7D5B;
  --ink-60: rgba(21, 23, 25, 0.62);
  --ink-70: rgba(21, 23, 25, 0.74);

  --wrap: 1180px;
  --wrap-wide: 1240px;
  --gutter: clamp(18px, 4vw, 32px);
  --nav-break: 960px;

  --radius-s: 8px;
  --radius-m: 16px;
  --radius-l: 26px;
  --pill: 999px;

  --shadow-1: 0 12px 30px -24px rgba(21, 23, 25, 0.6);
  --shadow-2: 0 20px 48px -32px rgba(21, 23, 25, 0.55);

  --font-display: "Arial Narrow", "Helvetica Neue", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(120% 60% at 100% 0%, rgba(216, 229, 231, 0.55), transparent 58%),
    radial-gradient(90% 50% at 0% 12%, rgba(233, 162, 59, 0.07), transparent 62%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.005em;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 5.6vw, 60px); }
h2 { font-size: clamp(24px, 3.4vw, 32px); }
h3 { font-size: clamp(18px, 2.2vw, 21px); letter-spacing: 0; }

p { text-wrap: pretty; }

strong { font-weight: 700; }

::selection {
  background: rgba(210, 59, 34, 0.18);
  color: var(--ink);
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--flame-deep);
  outline-offset: 3px;
  border-radius: 6px;
}

.site-footer :focus-visible {
  outline-color: var(--amber);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.muted { color: var(--ink-60); }

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

/* ---------- 容器与区块 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide {
  max-width: var(--wrap-wide);
}

.section {
  padding-block: clamp(44px, 7vw, 92px);
}

.section + .section {
  padding-top: 0;
}

.section-head {
  display: grid;
  gap: 12px;
  max-width: 46ch;
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--teal-deep);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--flame);
  border-radius: 2px;
}

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

.section-lede {
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.9;
  color: var(--ink-70);
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(20px, 3vw, 32px);
  background: linear-gradient(90deg, var(--line), var(--line-soft) 60%, transparent);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
              border-color 0.2s var(--ease), transform 0.2s var(--ease),
              box-shadow 0.2s var(--ease);
}

.btn--solid {
  background: var(--flame);
  color: var(--paper);
  box-shadow: 0 10px 22px -16px rgba(210, 59, 34, 0.9);
}

.btn--solid:hover { background: var(--flame-deep); transform: translateY(-1px); }

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

.btn--ghost:hover { background: var(--haze); border-color: var(--teal); }

.btn--quiet {
  background: var(--haze);
  color: var(--teal-deep);
}

.btn--quiet:hover { background: var(--cold); color: var(--ink); }

.btn--sm { padding: 8px 15px; font-size: 13px; }

.btn--block { width: 100%; }

/* ---------- 标签 / 卡片 / 栅格 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-70);
  white-space: nowrap;
}

.tag--teal { background: var(--haze); border-color: transparent; color: var(--teal-deep); }
.tag--amber { background: rgba(233, 162, 59, 0.16); border-color: rgba(233, 162, 59, 0.5); color: #8A5A10; }
.tag--green { background: rgba(46, 125, 91, 0.12); border-color: rgba(46, 125, 91, 0.35); color: var(--green); }

.card {
  position: relative;
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
  background: #FFFFFF;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-1);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease),
              border-color 0.22s var(--ease);
}

.card::after {
  content: "";
  position: absolute;
  left: clamp(18px, 2.6vw, 26px);
  right: clamp(18px, 2.6vw, 26px);
  bottom: 10px;
  height: 1px;
  background: linear-gradient(90deg, var(--teal), transparent 70%);
  opacity: 0;
  transition: opacity 0.22s var(--ease);
}

.card:hover,
.card:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: var(--line);
}

.card:hover::after,
.card:focus-within::after { opacity: 1; }

.card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.35;
}

.card-body { font-size: 15px; color: var(--ink-70); }

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--teal-deep);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 26px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1fr); }

/* ---------- 锚点目录 ---------- */
.index-list { display: grid; gap: 2px; }

.index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: 14.5px;
  color: var(--ink-70);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
              border-color 0.18s var(--ease);
}

.index-link:hover { color: var(--ink); background: var(--haze); border-left-color: var(--teal); }

.index-link[data-active="true"] {
  color: var(--flame-deep);
  font-weight: 700;
  background: var(--flame-soft);
  border-left-color: var(--flame);
}

/* ---------- 面包屑 ---------- */
.breadcrumb { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; color: var(--ink-60); }
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a:hover { color: var(--flame-deep); }
.breadcrumb [aria-current="page"] { color: var(--teal-deep); }

/* ---------- 正文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--ink-2);
}

.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 1.9em; }
.prose h3 { margin-top: 1.5em; }
.prose a { color: var(--flame-deep); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--flame); }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.45em; }

/* ---------- 图片容器基础 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(140deg, var(--haze) 0%, var(--cold) 46%, rgba(233, 162, 59, 0.16) 100%);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: auto -10% -35% 34%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(210, 59, 34, 0.22), transparent 68%);
  pointer-events: none;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px dashed rgba(35, 81, 92, 0.28);
  border-radius: calc(var(--radius-m) - 6px);
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame > img,
.media-frame > picture,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ink-60);
}

/* ---------- 显现（需 JS 开启 .js 才隐藏） ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}

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

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg,
    var(--paper) 0%,
    rgba(251, 248, 242, 0.94) 58%,
    rgba(251, 248, 242, 0) 100%);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 200;
  padding: 11px 20px;
  border-radius: var(--pill);
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  box-shadow: var(--shadow-2);
  transform: translateY(-190%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* 记分牌窄带 */
.header-rail {
  position: relative;
  background: var(--ink);
  color: var(--mist, #E8ECEE);
  color: var(--cold);
}

.rail-inner {
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding: 7px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.rail-line {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--cold);
}

.rail-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  color: #93A6AC;
  letter-spacing: 0.12em;
}

.rail-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(46, 125, 91, 0.24);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--flame), var(--amber));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.1s linear;
}

/* 胶囊浮岛 */
.header-shell {
  width: min(var(--wrap), calc(100% - 28px));
  margin: 12px auto 10px;
  padding: 8px 10px 8px 20px;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 22px);
  background: rgba(251, 248, 242, 0.92);
  border: 1px solid var(--line-soft);
  border-radius: var(--pill);
  box-shadow: 0 16px 40px -34px rgba(21, 23, 25, 0.8);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  backdrop-filter: blur(14px) saturate(1.15);
  transition: border-radius 0.24s var(--ease), box-shadow 0.24s var(--ease),
              padding 0.24s var(--ease);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  padding: 4px 2px;
  border-radius: var(--radius-s);
}

.brand-glyph {
  position: relative;
  width: 28px;
  height: 28px;
  flex: none;
  border-radius: 10px 4px 10px 4px;
  background: linear-gradient(140deg, var(--flame) 0%, #E4611F 58%, var(--amber) 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.36);
}

.brand-glyph::before,
.brand-glyph::after {
  content: "";
  position: absolute;
  left: 7px;
  right: 7px;
  height: 2px;
  border-radius: 2px;
  background: rgba(251, 248, 242, 0.9);
}

.brand-glyph::before { top: 10px; }
.brand-glyph::after { bottom: 9px; left: 11px; }

.brand-text { display: grid; gap: 1px; }

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.2;
  letter-spacing: 0.22em;
  color: var(--teal-deep);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}

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

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  border-radius: var(--pill);
  font-size: 14px;
  font-weight: 500;
  color: #3B4348;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--flame);
  transform: translateX(-50%);
  transition: width 0.2s var(--ease);
}

.nav-link:hover { color: var(--ink); background: var(--haze); }
.nav-link:hover::after { width: 16px; }

.nav-link[aria-current="page"] {
  color: var(--flame-deep);
  font-weight: 700;
  background: var(--flame-soft);
}

.nav-link[aria-current="page"]::after { width: 16px; }

.nav-cta-wrap { display: flex; flex: none; }
.nav-cta { padding: 10px 18px; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(255, 255, 255, 0.7);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-toggle:hover { background: var(--haze); border-color: var(--teal); }

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

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--flame);
  transition: transform 0.22s var(--ease), width 0.22s var(--ease);
}

.nav-toggle-bars span:last-child { width: 11px; margin-left: auto; }

.site-header[data-open] .nav-toggle-bars span:first-child { transform: translateY(3px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars span:last-child { width: 16px; transform: translateY(-3px) rotate(-45deg); }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 110px);
  background: var(--ink);
  color: var(--cold);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 260px;
  background:
    radial-gradient(120% 100% at 82% 0%, rgba(63, 124, 138, 0.5), transparent 62%),
    radial-gradient(80% 90% at 4% 0%, rgba(210, 59, 34, 0.18), transparent 66%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding: clamp(34px, 5.5vw, 64px) var(--gutter) 24px;
}

.footer-coord {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(24px, 3.4vw, 38px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: #8FA3A9;
}

.footer-coord::before {
  content: "";
  width: 38px;
  height: 1px;
  background: var(--flame);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.55fr);
  gap: clamp(28px, 5vw, 64px);
}

.footer-brand { max-width: 32ch; }

.footer-logo {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--paper);
}

.footer-line {
  margin-top: 12px;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.95;
  color: #D3DDE0;
}

.footer-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 6px 13px;
  border: 1px solid rgba(233, 162, 59, 0.45);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-col-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: #7E939A;
}

.footer-col-title .num {
  color: var(--amber);
  font-size: 10.5px;
  letter-spacing: 0.12em;
}

.footer-list { display: grid; gap: 9px; }

.footer-link {
  position: relative;
  display: inline-block;
  padding-left: 0;
  font-size: 14.5px;
  color: #C4D0D4;
  transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--flame);
  transform: translateY(-50%);
  transition: width 0.18s var(--ease);
}

.footer-link:hover { color: var(--paper); padding-left: 14px; }
.footer-link:hover::before { width: 9px; }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px 28px;
  margin-top: clamp(30px, 4.4vw, 46px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid rgba(232, 236, 238, 0.12);
}

.contact-item { display: grid; gap: 4px; }

.contact-key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: #7E939A;
}

.contact-val {
  font-size: 14.5px;
  line-height: 1.7;
  color: #E3E9EB;
  overflow-wrap: anywhere;
}

.contact-note {
  grid-column: 1 / -1;
  font-size: 12.5px;
  line-height: 1.85;
  color: #93A6AB;
  max-width: 62ch;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 22px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: 18px;
  border-top: 1px solid rgba(232, 236, 238, 0.1);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: #8FA3A9;
}

.footer-copy { color: #A9B8BD; }

.footer-legal { color: #8FA3A9; }

/* 页脚内按钮与标签的深底修正 */
.site-footer .btn--ghost {
  border-color: rgba(232, 236, 238, 0.24);
  color: var(--paper);
}

.site-footer .btn--ghost:hover {
  background: rgba(232, 236, 238, 0.12);
  border-color: var(--amber);
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 901px) {
  .grid--split { grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.38fr); }
}

@media (max-width: 1024px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-brand { max-width: none; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 118px; }

  .header-shell {
    flex-wrap: wrap;
    padding: 10px 12px 10px 16px;
    border-radius: 24px;
    gap: 8px 12px;
  }

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

  .site-nav {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-top: 6px;
    padding-top: 12px;
    border-top: 1px dashed var(--line);
  }

  .site-header[data-open] .header-shell {
    border-radius: 22px;
    box-shadow: 0 24px 50px -32px rgba(21, 23, 25, 0.7);
  }

  .site-header[data-open] .site-nav {
    display: flex;
    animation: nav-panel-in 0.2s var(--ease) both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    font-size: 15px;
    border-radius: 12px;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    border-left: 3px solid var(--flame);
    border-radius: 3px 12px 12px 3px;
  }

  .nav-cta-wrap { display: block; width: 100%; }
  .nav-cta { width: 100%; }

  .section { padding-block: clamp(36px, 8vw, 60px); }
}

@media (max-width: 720px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 20px; }
  .footer-inner { padding-bottom: 20px; }
}

@media (max-width: 620px) {
  .rail-meta { display: none; }
  .rail-inner { font-size: 11px; letter-spacing: 0.06em; }
  .brand-sub { display: none; }
  .brand-name { font-size: 17px; }
  .header-shell { margin: 10px auto 8px; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

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

/* ---------- 动效可访问性 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  html { scroll-behavior: auto; }

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

  .card:hover,
  .card:focus-within,
  .btn--solid:hover {
    transform: none;
  }
}