/* ==========================================================================
   KShell 官网样式
   深色终端风格 · 响应式 · 无外部依赖（不加载任何 CDN 资源）
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --bg:        #0a0e14;
  --bg-alt:    #0c1219;
  --surface:   #111a26;
  --surface-2: #16202e;
  --border:    #1f2b3d;
  --border-2:  #2a3a52;

  --text:      #c8d5e5;
  --text-strong: #eaf1fa;
  --muted:     #7f90a8;

  --green:     #3ddc84;
  --cyan:      #4cc9f0;
  --purple:    #a78bfa;
  --yellow:    #ffd166;
  --red:       #ff6b81;
  --blue:      #5b9dff;

  --radius:    12px;
  --radius-sm: 8px;
  --radius-lg: 18px;

  --mono: "SF Mono", "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas,
          "Liberation Mono", Menlo, "PingFang SC", "Microsoft YaHei", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --wrap: 1160px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { color: var(--text-strong); line-height: 1.25; margin: 0 0 .6em; }
p { margin: 0 0 1em; }
a { color: var(--cyan); text-decoration: none; transition: color .18s; }
a:hover { color: var(--green); }

code, pre, kbd { font-family: var(--mono); }

code {
  background: rgba(76, 201, 240, 0.1);
  border: 1px solid rgba(76, 201, 240, 0.16);
  border-radius: 5px;
  padding: .1em .4em;
  font-size: .88em;
  color: var(--cyan);
}

/* 仅在正文行内代码中禁止断词；代码块/终端内的换行必须保留 */
.card p code,
.note code,
.cmd-list code,
.panel p code,
.panel h3 code { white-space: nowrap; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }

/* ---------- 收缩安全 ----------
   自动网格（auto-fit/minmax）与 flex 子项默认 min-width:auto，
   会被内部长内容（长路径、代码块）撑开，导致横向溢出。
   这里统一允许收缩；配合内部 overflow-x:auto 实现局部滚动。 */
.cards > *,
.demo-grid > *,
.cmd-groups > *,
.themes > *,
.downloads > *,
.stats-inner > *,
.footer-links > *,
.hero-inner > * { min-width: 0; }

.card, .demo-block, .cmd-group, .theme-card, .dl-card,
.code-block, .mini-code, .theme-preview, .term, .term-body { min-width: 0; }

/* 列表型 flex 行同样允许收缩 */
.cmd-list li, .cmd-list li > *, .dl-meta, .dl-meta > * { min-width: 0; }
.dl-meta { flex-wrap: wrap; }
.cmd-list { overflow-wrap: anywhere; }
.muted { color: var(--muted); }
.arrow { color: var(--muted); margin: 0 .4em; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 20, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-strong);
  font-weight: 700;
  font-size: 1.12rem;
}
.brand:hover { color: var(--text-strong); }

.brand-mark {
  font-family: var(--mono);
  color: var(--green);
  background: rgba(61, 220, 132, 0.11);
  border: 1px solid rgba(61, 220, 132, 0.28);
  border-radius: 7px;
  padding: 3px 8px;
  font-size: .92rem;
  letter-spacing: -1px;
}

.brand-version {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--muted);
  border: 1px solid var(--border-2);
  border-radius: 20px;
  padding: 2px 9px;
  font-weight: 500;
}

.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav > a {
  color: var(--text);
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  font-size: .93rem;
  transition: background .18s, color .18s;
}
.site-nav > a:hover { background: var(--surface-2); color: var(--text-strong); }

.nav-gh {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border-2);
  color: var(--text-strong) !important;
  margin-left: 6px;
}
.nav-gh:hover { border-color: var(--green); background: rgba(61,220,132,.08) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 38px;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- 公告条（后台可控） ---------- */
.announcement {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  font-size: .9rem;
}
.announcement .wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 11px;
  padding-bottom: 11px;
  text-align: center;
}
.announcement-tag {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .05em;
  padding: 2px 9px;
  border-radius: 20px;
  white-space: nowrap;
}
.announcement a { font-weight: 600; white-space: nowrap; }

.announcement.is-info { background: rgba(76,201,240,.08); border-bottom-color: rgba(76,201,240,.28); }
.announcement.is-info .announcement-tag { background: rgba(76,201,240,.16); color: var(--cyan); }
.announcement.is-info a { color: var(--cyan); }

.announcement.is-success { background: rgba(61,220,132,.08); border-bottom-color: rgba(61,220,132,.28); }
.announcement.is-success .announcement-tag { background: rgba(61,220,132,.16); color: var(--green); }
.announcement.is-success a { color: var(--green); }

.announcement.is-warning { background: rgba(255,209,102,.08); border-bottom-color: rgba(255,209,102,.3); }
.announcement.is-warning .announcement-tag { background: rgba(255,209,102,.16); color: var(--yellow); }
.announcement.is-warning a { color: var(--yellow); }

/* ---------- 首屏 ---------- */
.hero { position: relative; padding: 74px 0 62px; overflow: hidden; }

.hero-glow {
  position: absolute;
  inset: -40% -10% auto -10%;
  height: 620px;
  background:
    radial-gradient(46% 52% at 22% 34%, rgba(61, 220, 132, .16), transparent 68%),
    radial-gradient(42% 48% at 72% 22%, rgba(76, 201, 240, .14), transparent 68%),
    radial-gradient(36% 40% at 52% 66%, rgba(167, 139, 250, .10), transparent 70%);
  filter: blur(14px);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 52px;
  align-items: center;
}

/* 关键：允许 grid 子项收缩到内容宽度以下，否则终端里的长路径会撑爆整列 */
.hero-inner > * { min-width: 0; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: 30px;
  padding: 6px 16px;
  font-size: .84rem;
  color: var(--muted);
  margin-bottom: 22px;
}
.pill strong { color: var(--green); font-family: var(--mono); }
.pill-sep { color: var(--border-2); }

.pill-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(61, 220, 132, .55);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(61,220,132,.5); }
  70%  { box-shadow: 0 0 0 9px rgba(61,220,132,0); }
  100% { box-shadow: 0 0 0 0 rgba(61,220,132,0); }
}

.hero h1 {
  font-size: clamp(2.05rem, 4.4vw, 3.35rem);
  letter-spacing: -.02em;
  margin-bottom: 20px;
}

.grad {
  background: linear-gradient(100deg, var(--green), var(--cyan) 55%, var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead { font-size: 1.06rem; color: var(--text); max-width: 33em; }
.lead strong { color: var(--text-strong); }

.cta-row { display: flex; flex-wrap: wrap; gap: 13px; margin: 30px 0 16px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  transition: transform .16s, box-shadow .2s, background .2s, border-color .2s;
  white-space: nowrap;
}
.btn-lg { padding: 14px 28px; font-size: 1rem; }

.btn-primary {
  background: linear-gradient(135deg, var(--green), #24c46f);
  color: #05210f;
  box-shadow: 0 10px 26px rgba(61, 220, 132, .22);
}
.btn-primary:hover {
  color: #05210f;
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(61, 220, 132, .3);
}

.btn-ghost {
  background: var(--surface);
  border-color: var(--border-2);
  color: var(--text-strong);
}
.btn-ghost:hover {
  border-color: var(--green);
  color: var(--text-strong);
  transform: translateY(-2px);
}

.cta-note { font-size: .84rem; color: var(--muted); }

/* ---------- 终端窗口 ---------- */
.term {
  background: #060a0f;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-width: 0;
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 15px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }
.term-title {
  margin-left: auto;
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--muted);
}

.term-body {
  margin: 0;
  padding: 20px;
  min-height: 344px;
  font-family: var(--mono);
  font-size: .845rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
/* 终端内的 code 必须保留换行，覆盖行内 code 的默认行为 */
.term-body code {
  white-space: pre-wrap;
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: 1em;
}
.term-body .t-user { color: var(--green); font-weight: 600; }
.term-body .t-dir  { color: var(--blue); }
.term-body .t-cmd  { color: var(--text-strong); }
.term-body .t-out  { color: #9fb0c6; }
.term-body .t-ok   { color: var(--green); }
.term-body .t-dim  { color: #5d6b80; }
.term-body .t-warn { color: var(--yellow); }
.term-body .t-cyan { color: var(--cyan); }

.cursor {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  background: var(--green);
  vertical-align: text-bottom;
  animation: blink 1.05s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

/* ---------- 数据条 ---------- */
.stats { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.stats-inner {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  padding: 26px 22px;
  text-align: center;
}
.stat b {
  display: block;
  font-family: var(--mono);
  font-size: 1.65rem;
  color: var(--green);
  line-height: 1.2;
}
.stat span { font-size: .82rem; color: var(--muted); }

/* ---------- 通用区块 ---------- */
.section { padding: 82px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.section-head { max-width: 760px; margin: 0 auto 46px; text-align: center; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.15rem); letter-spacing: -.01em; }
.section-head p { color: var(--muted); margin: 0; }

/* ---------- 特性卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(310px, 100%), 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .3);
}
.card h3 { font-size: 1.08rem; margin-bottom: .5em; }

/* 版本新增标记 */
.tag-new {
  display: inline-block;
  vertical-align: middle;
  font-size: .64rem;
  font-weight: 700;
  letter-spacing: .03em;
  color: #05210f;
  background: linear-gradient(135deg, var(--green), #24c46f);
  border-radius: 20px;
  padding: 2px 8px;
  margin-left: 4px;
  transform: translateY(-1px);
}

.card p { font-size: .92rem; color: var(--muted); margin-bottom: 14px; }
.card p strong { color: var(--text); }

.card-icon {
  width: 42px; height: 42px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  font-size: 1.2rem;
  margin-bottom: 16px;
  font-family: var(--mono);
}
.icon-cyan   { background: rgba(76,201,240,.13);  color: var(--cyan);   border: 1px solid rgba(76,201,240,.25); }
.icon-green  { background: rgba(61,220,132,.13);  color: var(--green);  border: 1px solid rgba(61,220,132,.25); }
.icon-purple { background: rgba(167,139,250,.13); color: var(--purple); border: 1px solid rgba(167,139,250,.25); }
.icon-yellow { background: rgba(255,209,102,.13); color: var(--yellow); border: 1px solid rgba(255,209,102,.25); }
.icon-blue   { background: rgba(91,157,255,.13);  color: var(--blue);   border: 1px solid rgba(91,157,255,.25); }
.icon-red    { background: rgba(255,107,129,.13); color: var(--red);    border: 1px solid rgba(255,107,129,.25); }

.mini-code {
  margin: 0;
  background: #070b11;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  font-size: .8rem;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text);
}
.mini-code code { background: none; border: none; padding: 0; color: inherit; font-size: 1em; white-space: pre; }
.mini-code .c { color: #5d6b80; }

/* ---------- 演示区 ---------- */
.demo-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(400px, 100%), 1fr)); gap: 22px; }

.demo-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
}
.demo-block h3 { font-size: 1.05rem; }
.demo-desc { font-size: .9rem; color: var(--muted); }

.code-block {
  margin: 0 0 12px;
  background: #070b11;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 15px 16px;
  font-size: .815rem;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--text);
}
.code-block code { background: none; border: none; padding: 0; color: inherit; font-size: 1em; white-space: pre; }
.code-block .p { color: var(--green); font-weight: 700; }
.code-block .c { color: #5d6b80; }

.cmd-list { list-style: none; padding: 0; margin: 0 0 18px; }
.cmd-list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px dashed var(--border);
  font-size: .875rem;
}
.cmd-list li:last-child { border-bottom: none; }
.cmd-list code { flex-shrink: 0; min-width: 130px; }
.cmd-list span { color: var(--muted); }

/* ---------- 命令参考 ---------- */
.cmd-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); gap: 18px; }

.cmd-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.cmd-group h3 { font-size: .95rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 14px; }
.cmd-group p { margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.cmd-group code { background: var(--surface-2); border-color: var(--border-2); color: var(--text); font-size: .795rem; padding: .2em .5em; }

.note {
  margin-top: 24px;
  background: rgba(76, 201, 240, .06);
  border: 1px solid rgba(76, 201, 240, .2);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: .9rem;
}
.note strong { color: var(--cyan); }

/* ---------- 主题 ---------- */
.themes { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(252px, 100%), 1fr)); gap: 18px; }

.theme-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .18s, border-color .18s;
}
.theme-card:hover { transform: translateY(-3px); border-color: var(--border-2); }

.theme-bar { display: flex; height: 8px; }
.theme-bar i { flex: 1; }

.theme-body { padding: 16px 18px; }
.theme-name { font-family: var(--mono); font-weight: 600; color: var(--text-strong); font-size: .92rem; margin-bottom: 10px; }
.theme-preview {
  font-family: var(--mono);
  font-size: .79rem;
  line-height: 1.7;
  background: #070b11;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  overflow-x: auto;
  white-space: pre;
}

/* ---------- 下载卡片 ---------- */
.downloads {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 18px;
  margin-bottom: 34px;
}

.dl-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.dl-card:hover {
  transform: translateY(-4px);
  border-color: var(--green);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .32);
}
.dl-card.is-featured { border-color: rgba(61,220,132,.4); background: linear-gradient(180deg, rgba(61,220,132,.06), var(--surface) 42%); }

.dl-badge {
  position: absolute;
  top: -11px; right: 18px;
  background: var(--green);
  color: #05210f;
  font-size: .68rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: .04em;
}

.dl-os { display: flex; align-items: center; gap: 11px; margin-bottom: 12px; }
.dl-os svg { color: var(--text-strong); flex-shrink: 0; }
.dl-os h3 { margin: 0; font-size: 1.06rem; }

.dl-file { font-family: var(--mono); font-size: .78rem; color: var(--muted); word-break: break-all; margin-bottom: 6px; }
.dl-meta { display: flex; gap: 14px; font-size: .78rem; color: var(--muted); margin-bottom: 18px; }
.dl-meta b { color: var(--green); font-weight: 600; }

.dl-card .btn { margin-top: auto; width: 100%; }

.dl-hint { font-size: .78rem; color: var(--muted); margin: 10px 0 0; }

.downloads-foot { display: flex; flex-wrap: wrap; gap: 13px; justify-content: center; }

.download-note {
  margin: 10px 0 0;
  font-size: .88rem;
  color: var(--cyan);
}

/* ---------- 安装选项卡 ---------- */
.tabs {
  display: flex;
  gap: 7px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.tab {
  background: var(--surface);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: 10px 24px;
  border-radius: 30px;
  font-size: .92rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all .18s;
}
.tab:hover { border-color: var(--green); color: var(--text-strong); }
.tab.is-active {
  background: linear-gradient(135deg, var(--green), #24c46f);
  border-color: transparent;
  color: #05210f;
}

.tab-panels { max-width: 820px; margin: 0 auto; }
.panel { display: none; }
.panel.is-active { display: block; animation: fadeUp .3s ease; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

.panel h3 { font-size: 1rem; margin: 26px 0 10px; }
.panel h3:first-child { margin-top: 0; }
.panel p { font-size: .9rem; color: var(--muted); }

.code-wrap { position: relative; }
.code-wrap .code-block { padding-right: 74px; }

.copy-btn {
  position: absolute;
  top: 9px; right: 9px;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  color: var(--muted);
  font-size: .73rem;
  font-family: var(--sans);
  padding: 5px 11px;
  border-radius: 6px;
  cursor: pointer;
  transition: all .18s;
}
.copy-btn:hover { border-color: var(--green); color: var(--green); }
.copy-btn.is-done { border-color: var(--green); color: var(--green); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); padding: 54px 0 26px; }

.footer-inner {
  display: grid;
  grid-template-columns: 1.1fr 2fr;
  gap: 40px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--border);
}

.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-brand b { color: var(--text-strong); font-size: 1.1rem; }
.footer-brand p { font-size: .86rem; color: var(--muted); margin: 2px 0 0; }

.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-links h4 { font-size: .82rem; color: var(--muted); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 12px; }
.footer-links a { display: block; font-size: .88rem; color: var(--text); margin-bottom: 8px; }
.footer-links a:hover { color: var(--green); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  padding-top: 22px;
}
.footer-bottom p { font-size: .82rem; color: var(--muted); margin: 0; }
.footer-term code { color: var(--muted); background: none; border: none; }
.footer-term .p { color: var(--green); }

/* ---------- 滚动动画 ---------- */
/* 仅在 JS 可用时隐藏，避免禁用 JS 时内容不可见 */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding-top: 52px; }
  .hero-term { order: 2; }
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 760px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: absolute;
    top: 66px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 8px 14px 16px;
    max-height: 0;
    overflow: hidden;
    transition: max-height .25s ease;
  }
  .site-nav.is-open { max-height: 420px; }
  .site-nav > a { padding: 12px 8px; }
  .nav-gh { margin: 8px 0 0; justify-content: center; }

  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat:last-child { grid-column: span 2; }

  .section { padding: 58px 0; }
  .demo-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .term-body { min-height: 288px; font-size: .78rem; }
  .cmd-list code { min-width: 108px; }
}

@media (max-width: 420px) {
  .brand-version { display: none; }
  .btn-lg { width: 100%; }
  .cta-row { flex-direction: column; }
}

/* ---------- 无障碍：减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal, .js .reveal { opacity: 1; transform: none; }
}
/* ---------- 打印 ---------- */
@media print {
  .site-header, .hero-glow, .nav-toggle, .downloads-foot, .copy-btn { display: none; }
  body { background: #fff; color: #000; }
  .card, .term, .code-block { border-color: #ccc; }
  .reveal, .js .reveal { opacity: 1 !important; transform: none !important; }
}