/* ============================================================
   Clash官网 · 「晨雾玻璃」设计系统 —— 基础层 base.css
   内容：设计令牌 / 重置 / 排版 / 按钮 / 头部 / 页脚 /
         通用玻璃面板与卡片 / .reveal 滚动动效 / 响应式
   规则：所有颜色、字体、圆角只允许来自 :root 令牌
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 色彩：核心 */
  --c-bg: #F7F5F8;
  --c-panel: #FDFCFE;
  --c-panel-2: #F1EDF4;
  --c-line: #E3DAE6;
  --c-accent: #8A3B66;
  --c-accent-deep: #6D2C50;
  --c-ink: #2B2230;
  --c-ink-mute: #6F6378;
  --c-ok: #2E7D5B;
  --c-warn: #B07A1E;
  --c-err: #C24343;

  /* 色彩：玻璃与柔焦派生 */
  --glass-fill: rgba(253, 252, 254, 0.72);
  --glass-fill-strong: rgba(253, 252, 254, 0.88);
  --glass-line: rgba(227, 218, 230, 0.92);
  --glass-blur: 14px;
  --blob-plum: rgba(138, 59, 102, 0.15);
  --blob-gold: rgba(176, 122, 30, 0.12);
  --accent-soft: rgba(138, 59, 102, 0.10);
  --accent-mist: rgba(138, 59, 102, 0.24);
  --ok-soft: rgba(46, 125, 91, 0.12);
  --warn-soft: rgba(176, 122, 30, 0.14);
  --err-soft: rgba(194, 67, 67, 0.12);

  /* 阴影 */
  --shadow-float: 0 18px 44px -20px rgba(43, 34, 48, 0.20), 0 2px 10px rgba(43, 34, 48, 0.05);
  --shadow-hush: 0 10px 26px -16px rgba(43, 34, 48, 0.14);

  /* 字体 */
  --font-display: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', -apple-system, 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', -apple-system, 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* 形状与节奏 */
  --r-lg: 20px;
  --r-md: 16px;
  --r-sm: 10px;
  --r-pill: 999px;
  --wrap-max: 1128px;
  --gap-panel: clamp(20px, 3vw, 32px);
  --dur-soft: 0.45s;
  --ease-drift: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-ink);
  background: var(--c-bg);
  overflow-x: hidden;
  min-height: 100vh;
}

img { max-width: 100%; height: auto; }

button { font-family: inherit; }

::selection { background: var(--accent-mist); }

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

/* ---------- 3. 晨雾底景：两枚缓慢漂移的柔焦色斑 ---------- */
body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}

body::before {
  width: 52vw;
  height: 52vw;
  min-width: 420px;
  min-height: 420px;
  left: -14vw;
  top: -12vw;
  background: radial-gradient(closest-side, var(--blob-plum), transparent 72%);
  animation: mist-drift-a 46s var(--ease-drift) infinite alternate;
}

body::after {
  width: 44vw;
  height: 44vw;
  min-width: 360px;
  min-height: 360px;
  right: -10vw;
  top: 32vh;
  background: radial-gradient(closest-side, var(--blob-gold), transparent 70%);
  animation: mist-drift-b 58s var(--ease-drift) infinite alternate;
}

@keyframes mist-drift-a {
  to { transform: translate(9vw, 14vh) scale(1.12); }
}

@keyframes mist-drift-b {
  to { transform: translate(-8vw, -10vh) scale(0.92); }
}

/* ---------- 4. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.28;
  color: var(--c-ink);
  margin: 0 0 0.55em;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.45rem, 2.8vw, 2rem);
  letter-spacing: -0.01em;
}

h3 { font-size: clamp(1.12rem, 1.8vw, 1.3rem); }

h4 { font-size: 1.02rem; }

p { margin: 0 0 1em; }

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

a {
  color: var(--c-accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-mist);
  text-underline-offset: 3px;
  transition: color 0.25s;
}

a:hover { color: var(--c-accent-deep); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ink-mute);
  margin: 0 0 14px;
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-accent);
  flex-shrink: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--c-line);
  margin: 32px 0;
}

blockquote {
  margin: 20px 0;
  padding: 14px 22px;
  border-left: 3px solid var(--c-accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--accent-soft);
  color: var(--c-ink);
}

blockquote p:last-child { margin-bottom: 0; }

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

code {
  background: var(--c-panel-2);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 0.88em;
}

pre {
  background: var(--c-panel-2);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
  max-width: 100%;
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

/* 表格 */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 520px;
}

th, td {
  padding: 12px 18px;
  text-align: left;
  border-bottom: 1px solid var(--c-line);
  vertical-align: top;
}

th {
  background: var(--c-panel-2);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-ink-mute);
  font-weight: 600;
  white-space: nowrap;
}

tbody tr:last-child td { border-bottom: none; }

/* ---------- 5. 布局容器 ---------- */
.wrap {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 28px);
}

.section { padding: clamp(48px, 7vw, 88px) 0; }

.section-head { max-width: 640px; margin-bottom: clamp(28px, 4vw, 44px); }

/* 左窄右宽非对称双栏 */
.split-nw {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: var(--gap-panel);
  align-items: start;
}

.split-nw > * { min-width: 0; }

/* 玻璃面板之间的轻微叠压错位 */
.drift-up { transform: translateY(-16px); }
.drift-down { transform: translateY(16px); }

/* ---------- 6. 玻璃面板与卡片 ---------- */
.glass {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-hush);
}

.glass-strong {
  background: var(--glass-fill-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-float);
}

.panel {
  padding: clamp(20px, 3.4vw, 34px);
}

.card {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  padding: 22px 24px;
  box-shadow: var(--shadow-hush);
  transition: transform var(--dur-soft) var(--ease-drift), box-shadow var(--dur-soft) var(--ease-drift), border-color 0.3s;
  min-width: 0;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
  border-color: var(--accent-mist);
}

.card h3 { margin-bottom: 8px; }

.card p { color: var(--c-ink-mute); font-size: 14.5px; margin-bottom: 0; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 18px;
}

.card-grid > * { min-width: 0; }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--r-pill);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease-drift), box-shadow 0.25s, background 0.25s, border-color 0.25s, color 0.25s;
  -webkit-user-select: none;
  user-select: none;
}

.btn svg { flex-shrink: 0; }

.btn-solid {
  background: var(--c-accent);
  color: var(--c-panel);
  box-shadow: 0 10px 22px -10px var(--accent-mist);
}

.btn-solid:hover {
  background: var(--c-accent-deep);
  color: var(--c-panel);
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -10px var(--accent-mist);
}

.btn-solid:active { transform: translateY(0); }

.btn-glass {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border-color: var(--glass-line);
  color: var(--c-ink);
}

.btn-glass:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  transform: translateY(-2px);
}

.btn-quiet {
  background: transparent;
  color: var(--c-ink-mute);
  padding: 10px 18px;
}

.btn-quiet:hover { color: var(--c-accent); }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
}

.btn-sm { padding: 8px 18px; font-size: 13.5px; }

.btn-lg { padding: 15px 34px; font-size: 16px; }

/* ---------- 8. 徽章 / 小胶囊 ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border-radius: var(--r-pill);
  background: var(--c-panel-2);
  border: 1px solid var(--c-line);
  font-size: 13px;
  color: var(--c-ink-mute);
  white-space: nowrap;
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent);
  flex-shrink: 0;
}

.pill-dot.is-live { animation: dot-breathe 2.4s ease-in-out infinite; }

@keyframes dot-breathe {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--accent-mist); }
  50% { opacity: 0.55; box-shadow: 0 0 0 5px transparent; }
}

.badge-ok { background: var(--ok-soft); color: var(--c-ok); border-color: transparent; }
.badge-warn { background: var(--warn-soft); color: var(--c-warn); border-color: transparent; }
.badge-err { background: var(--err-soft); color: var(--c-err); border-color: transparent; }
.badge-accent { background: var(--accent-soft); color: var(--c-accent); border-color: transparent; }

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0;
}

/* ---------- 9. 头部导航 ---------- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.hd-shell {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-line);
}

.hd-bar {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 28px);
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.hd-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.hd-brand img {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.hd-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.hd-nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--c-ink-mute);
  text-decoration: none;
  transition: color 0.25s, background 0.25s;
}

.hd-nav a:hover {
  color: var(--c-accent);
  background: var(--accent-soft);
}

.hd-nav a.is-here {
  color: var(--c-accent-deep);
  background: var(--accent-soft);
  font-weight: 600;
}

/* 语言切换 */
.lang-box {
  position: relative;
  flex-shrink: 0;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  background: transparent;
  color: var(--c-ink-mute);
  font-size: 13.5px;
  cursor: pointer;
  transition: border-color 0.25s, color 0.25s;
}

.lang-btn:hover { border-color: var(--c-accent); color: var(--c-accent); }

.lang-btn svg { flex-shrink: 0; }

.lang-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 168px;
  background: var(--glass-fill-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-float);
  padding: 8px;
  display: none;
  flex-direction: column;
  gap: 2px;
}

.lang-menu.is-open { display: flex; }

.lang-menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 13px;
  border-radius: var(--r-sm);
  font-size: 14px;
  color: var(--c-ink);
  text-decoration: none;
}

.lang-menu a:hover { background: var(--accent-soft); color: var(--c-accent-deep); }

.lang-menu a.is-current {
  color: var(--c-accent);
  font-weight: 600;
  background: var(--accent-soft);
}

.lang-menu a.is-current::after {
  content: "•";
  color: var(--c-accent);
}

/* 汉堡按钮 */
.hd-burger {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--r-sm);
  border: 1px solid var(--c-line);
  background: transparent;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--c-ink);
}

.hd-burger svg { display: block; }

/* ---------- 10. 页脚 ---------- */
#site-footer { margin-top: clamp(48px, 7vw, 88px); }

.ft-shell {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--glass-line);
  padding: clamp(36px, 5vw, 56px) 0 0;
}

.ft-grid {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 28px);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.ft-grid > * { min-width: 0; }

.ft-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--c-ink);
  margin-bottom: 12px;
}

.ft-brand img { width: 26px; height: 26px; flex-shrink: 0; }

.ft-desc {
  font-size: 13.5px;
  color: var(--c-ink-mute);
  line-height: 1.8;
  margin: 0;
}

.ft-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-ink-mute);
  margin: 0 0 14px;
}

.ft-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.ft-links a {
  font-size: 14px;
  color: var(--c-ink-mute);
  text-decoration: none;
}

.ft-links a:hover { color: var(--c-accent); }

.ft-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ft-tags a {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  font-size: 12.5px;
  color: var(--c-ink-mute);
  text-decoration: none;
  transition: border-color 0.25s, color 0.25s;
}

.ft-tags a:hover { border-color: var(--c-accent); color: var(--c-accent); }

.ft-langs {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.ft-langs a {
  font-size: 14px;
  color: var(--c-ink-mute);
  text-decoration: none;
}

.ft-langs a:hover { color: var(--c-accent); }

.ft-langs a.is-current { color: var(--c-accent); font-weight: 600; }

.ft-legal {
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--c-line);
  padding: 18px clamp(16px, 4vw, 28px);
  text-align: center;
  font-size: 13px;
  color: var(--c-ink-mute);
}

/* ---------- 11. 滚动淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease-drift), transform 0.7s var(--ease-drift);
}

.reveal.shown {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  body::before, body::after { animation: none; }
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 900px) {
  .split-nw { grid-template-columns: 1fr; }
  .drift-up, .drift-down { transform: none; }
  .ft-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}

@media (max-width: 820px) {
  .hd-burger { display: inline-flex; margin-left: auto; }

  .hd-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px clamp(16px, 4vw, 28px) 16px;
    background: var(--glass-fill-strong);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-line);
    box-shadow: var(--shadow-hush);
    display: none;
  }

  .hd-nav.is-open { display: flex; }

  .hd-nav a {
    padding: 12px 14px;
    border-radius: var(--r-sm);
    font-size: 15px;
  }

  .lang-box { margin-left: 0; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }

  .ft-grid { grid-template-columns: 1fr; }

  pre { padding: 13px 15px; font-size: 12.5px; }

  .btn { padding: 11px 22px; }

  .card { padding: 18px 18px; }

  .pill { font-size: 12px; padding: 4px 11px; }
}

@media (max-width: 400px) {
  .hd-bar { min-height: 58px; gap: 10px; }
  .hd-brand { font-size: 15px; }
  .hd-brand img { width: 26px; height: 26px; }
  .lang-btn { padding: 7px 11px; font-size: 12.5px; }
}
@media (max-width: 820px) {
  html.nav-lock { overflow: hidden; }
  .hd-nav.is-open {
    max-height: calc(100vh - 64px);
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
}