:root{
  /* 深色主题：以蓝色为主调的夜空蓝灰 */
  --bg: #0f1522;               /* 蓝黑基调 */
  --bg-secondary: #141b2b;     /* 次级蓝灰 */
  --surface: #1a2335;          /* 提升层次的表面色 */
  --surface-elevated: #1f2a3f; /* 更亮的悬浮层 */
  --text: #eef3f8;             /* 高可读浅色文本 */
  --muted: #c2c9d8;            /* 次级文本 */
  --primary: #5a8fe0;          /* 主蓝（降饱和） */
  --primary-strong: #2a6ee0;   /* 强化主蓝（降饱和） */
  --accent: #9b8cff;           /* 辅助紫蓝 */
  --success: #3ee0a8;
  --warning: #ffd666;
  --danger: #ff7575;
  --border: #2b3550;           /* 冷调边框 */
  --border-subtle: #1b2438;    /* 低对比分隔 */
  /* 蓝灰阴影（避免纯黑） */
  --shadow: 0 8px 24px rgba(23,32,54,.32);
  --shadow-elevated: 0 16px 40px rgba(23,32,54,.44);
  --glow: 0 0 22px rgba(95,163,255,.20);
}

[data-theme="light"]{
  --bg: #f6f8fd;
  --bg-secondary: #eef2ff;
  --surface: #ffffff;
  --text: #0a1020;
  --muted: #5b6171; /* 对比度良好 */
  --primary: #2a6ee0;
  --primary-strong: #1a59c4;
  --accent: #6b5cff;
  --success: #16a679;
  --warning: #c68600;
  --danger: #d63c3c;
  --border: #d9dced;
  /* 替换黑色阴影为蓝灰分层阴影 */
  --shadow: 0 6px 16px rgba(17, 36, 66, .10), 0 2px 6px rgba(17, 36, 66, .06);
  --shadow-elevated: 0 14px 36px rgba(17, 36, 66, .16), 0 4px 12px rgba(17, 36, 66, .10);
  --glow: 0 0 20px rgba(47,128,255,.18);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color:var(--text);
  /* 优化渐变背景：深蓝灰渐变，更柔和舒适 */
  background:
    radial-gradient(ellipse 1400px 700px at 50% -15%, rgba(68, 118, 210, 0.08), transparent),
    radial-gradient(ellipse 1000px 500px at 85% 100%, rgba(95, 163, 255, 0.06), transparent),
    radial-gradient(ellipse 800px 400px at 15% 100%, rgba(155, 140, 255, 0.05), transparent),
    linear-gradient(180deg, var(--bg) 0%, color-mix(in oklab, var(--bg), white 7%) 50%, var(--bg) 100%);
  line-height:1.65;
}

/* 浅色主题专用渐变背景 */
[data-theme="light"] body{
  background:
    radial-gradient(ellipse 1400px 700px at 50% -15%, rgba(68, 118, 210, 0.04), transparent),
    radial-gradient(ellipse 1000px 500px at 85% 100%, rgba(95, 163, 255, 0.03), transparent),
    radial-gradient(ellipse 800px 400px at 15% 100%, rgba(155, 140, 255, 0.025), transparent),
    linear-gradient(180deg, var(--bg) 0%, color-mix(in oklab, var(--bg), var(--primary) 2%) 50%, var(--bg) 100%);
}

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

.container{max-width:1200px;margin:0 auto;padding:0 24px} /* 增加左右边距 */
.section{padding:96px 0} /* 增加垂直节奏 80px → 96px */
.section.alt{background:linear-gradient(180deg, transparent, rgba(255,255,255,0.018) 20%, transparent),
             linear-gradient(to right, rgba(255,255,255,.035) 1px, transparent 1px),
             linear-gradient(to bottom, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size:auto, 48px 48px, 48px 48px; /* 网格更稀疏 */
  background-position:0 0, 0 0, 0 0;
  mask-image:linear-gradient(to bottom, transparent, color-mix(in oklab, var(--bg), white 6%) 15%, color-mix(in oklab, var(--bg), white 6%) 85%, transparent)
}
.section-title{font-size:36px;margin:0 0 28px 0;letter-spacing:.3px;font-weight:700} /* 加大字号和间距 */
.lead{font-size:19px;color:var(--muted);max-width:900px;line-height:1.7} /* 优化行高 */

/* In-page sub navigation */
.subnav{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 8px}
.subnav a{
  display:inline-block;
  padding:8px 12px;
  font-size:14px;
  color:var(--muted);
  text-decoration:none;
  border:1px solid var(--border);
  border-radius:999px;
  background:color-mix(in oklab, var(--surface), white 4%);
  transition:all .2s ease;
}
.subnav a:hover{color:var(--text);border-color:rgba(95,163,255,.35);box-shadow:0 2px 8px rgba(23,32,54,.18)}

/* Aesthetic polish */
/* Balanced headings for nicer rag */
h1, h2, .section-title, .headline{text-wrap:balance}

/* Decorative underline for section titles */
.section-title{position:relative}
.section-title:after{content:"";position:absolute;left:0;bottom:-10px;width:64px;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--primary),var(--accent))}

/* Refined cards with gradient-border glass feel */
.card{
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--surface), white 3%), color-mix(in oklab, var(--surface), var(--bg) 3%)) padding-box,
    linear-gradient(120deg, color-mix(in oklab, var(--primary), white 18%), color-mix(in oklab, var(--accent), white 18%)) border-box;
  border:1px solid transparent;
}
/* 深色模式回退 */
@supports not (color: color-mix(in oklab, red, blue)) {
  .card{
    background: linear-gradient(180deg, #13151c, #0f1116);
    border: 1px solid #2a2d3e;
  }
}

.meta-item{
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--surface), white 4%), color-mix(in oklab, var(--surface), var(--bg) 2%)) padding-box,
    linear-gradient(120deg, color-mix(in oklab, var(--primary), white 22%), color-mix(in oklab, var(--accent), white 22%)) border-box;
  border:1px solid transparent;
}

/* Hero headline glow - 增强视觉冲击 */
.headline span{
  filter:drop-shadow(0 8px 24px rgba(106,169,255,.28));
  animation:headline-pulse 4s ease-in-out infinite;
}
@keyframes headline-pulse{
  0%,100%{filter:drop-shadow(0 8px 24px rgba(106,169,255,.28))}
  50%{filter:drop-shadow(0 10px 32px rgba(106,169,255,.35))}
}

.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:12px;top:12px;width:auto;height:auto;background:var(--surface);color:var(--text);padding:8px 12px;border-radius:10px;box-shadow:var(--shadow)}

/* Header - 优化层次和视觉 */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:color-mix(in oklab, var(--bg), white 6%);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
  box-shadow:0 2px 8px rgba(23,32,54,.20);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text);transition:opacity .2s}
.brand:hover{opacity:.8}
.brand .logo{display:flex;align-items:center}
.brand .brand-text{font-weight:700;letter-spacing:.3px;font-size:15px}
.nav-toggle{display:none;background:transparent;border:0;cursor:pointer}
.nav-toggle .bar{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;border-radius:1px;transition:all .2s}
.nav-menu{list-style:none;display:flex;gap:4px;padding:0;margin:0}
.nav-menu a{display:inline-block;padding:10px 14px;color:var(--muted);text-decoration:none;border-radius:10px;font-size:14.5px;font-weight:500;transition:all .2s}
.nav-menu a:hover,.nav-menu a[aria-current="page"]{color:var(--text);background:rgba(255,255,255,.10)}

/* Nav underline animation - 优化 */
.nav-menu a{position:relative}
.nav-menu a:after{content:"";position:absolute;left:14px;right:14px;bottom:7px;height:2px;border-radius:2px;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,var(--primary),var(--accent));transition:transform .3s cubic-bezier(0.4, 0, 0.2, 1)}
.nav-menu a:hover:after,.nav-menu a[aria-current="page"]:after{transform:scaleX(1)}

/* 面包屑导航 */
.breadcrumb{
  display:flex;
  align-items:center;
  gap:8px;
  padding:20px 0;
  margin-bottom:16px;
  font-size:14px;
  color:var(--muted);
  flex-wrap:wrap;
}
.breadcrumb a{
  color:var(--muted);
  text-decoration:none;
  transition:color .2s;
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:6px 10px;
  border:1px solid var(--border);
  border-radius:999px;
  background:color-mix(in oklab, var(--surface), white 4%);
  line-height:1;
}
.breadcrumb a:hover{color:var(--text);border-color:rgba(95,163,255,.35);box-shadow:0 2px 8px rgba(23,32,54,.18)}
.breadcrumb span{color:var(--text);font-weight:500}
.breadcrumb .separator{
  opacity:.4;
  user-select:none;
}

/* Breadcrumb: emphasize home token */
.breadcrumb a:first-child{
  font-weight:600;
  color:var(--text);
  background:linear-gradient(135deg, color-mix(in oklab, var(--primary), transparent 88%), color-mix(in oklab, var(--accent), transparent 92%));
}

/* Utilities */
.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}
.text-muted{color:var(--muted)}
.text-sm{font-size:14px}
.mt-8{margin-top:8px}
.flex{display:flex}
.items-center{align-items:center}
.gap-12{gap:12px}
.mt-12{margin-top:12px}
.mt-16{margin-top:16px}
.mt-20{margin-top:20px}
.mt-24{margin-top:24px}
.text-center{text-align:center}
.justify-center{justify-content:center}

/* Hero */
.hero{position:relative;padding:120px 0 80px}
.headline{font-size:36px;line-height:1.25;margin:0 0 12px 0}
.headline span{display:block;font-size:48px;background:linear-gradient(90deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.subhead{color:var(--muted);font-size:18px;max-width:760px}
.hero-cta{display:flex;gap:12px;margin:22px 0 18px}
.hero-meta{display:flex;gap:20px;flex-wrap:wrap}
.meta-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 14px;min-width:220px;box-shadow:var(--shadow)}
.meta-item .label{display:block;color:var(--muted);font-size:12px;margin-bottom:4px}
.hero-art{position:absolute;inset:0;pointer-events:none}
.hero-art .orb{position:absolute;right:10%;top:10%;width:220px;height:220px;background:radial-gradient(circle at 30% 30%, #6aa9ff, transparent 60%), radial-gradient(circle at 70% 70%, #9b8cff, transparent 60%);filter:blur(10px);opacity:.7;border-radius:50%}
.hero-art .grid{position:absolute;left:0;right:0;bottom:0;top:40%;background-image:linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),linear-gradient(to top, rgba(255,255,255,.05) 1px, transparent 1px);background-size:40px 40px;mask-image:linear-gradient(to bottom, transparent, color-mix(in oklab, var(--bg), white 6%) 30%)}
.hero-art .wave{position:absolute;left:0;right:0;bottom:-1px;width:100%;height:120px;color:#fff}

/* Buttons - 增强微交互 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--border);
  background:var(--surface);
  color:var(--text);
  padding:12px 20px; /* 增加内边距，触摸目标更大 */
  border-radius:12px; /* 圆角更大 */
  text-decoration:none;
  cursor:pointer;
  font-weight:500;
  transition:transform .12s cubic-bezier(0.4, 0, 0.2, 1), 
             background .2s ease,
             box-shadow .2s ease;
}
.btn:hover{
  transform:translateY(-2px) scale(1.02); /* 更明显的悬停效果 */
  box-shadow:var(--shadow-elevated);
}
.btn:active{transform:translateY(0) scale(0.98)} /* 按下反馈 */
.btn.primary{
  background:linear-gradient(180deg,var(--primary),var(--primary-strong));
  border-color:transparent;
  color:#fff;
  box-shadow:0 4px 12px rgba(47,128,255,.3);
}
.btn.primary:hover{box-shadow:0 8px 20px rgba(47,128,255,.45)}
.btn.ghost{background:transparent;border-width:1.5px}
.btn.ghost:hover{background:rgba(255,255,255,.08)}
.btn.small{padding:8px 14px;font-size:14px}

/* Primary button shimmer - 优化动画 */
.btn.primary{position:relative;overflow:hidden}
.btn.primary:after{
  content:"";
  position:absolute;
  inset:-30%;
  background:linear-gradient(110deg, transparent 35%, rgba(255,255,255,.45) 50%, transparent 65%);
  transform:translateX(-120%);
}
.btn.primary:hover:after{
  transition:transform .9s cubic-bezier(0.4, 0, 0.2, 1);
  transform:translateX(120%);
}

/* Grids & Cards - 优化间距和层次 */
.grid{display:grid;gap:24px} /* 增加网格间距 */
.grid.two{grid-template-columns:repeat(2,1fr)}
.grid.cards{grid-template-columns:repeat(2,1fr)}
.grid.cards.three{grid-template-columns:repeat(3,1fr);gap:28px} /* 三栏更宽松 */
.card{
  background:linear-gradient(135deg, var(--surface) 0%, var(--bg-secondary) 100%);
  border:1px solid var(--border);
  border-radius:16px;
  padding:28px;
  box-shadow:var(--shadow);
  transition:transform .25s cubic-bezier(0.4, 0, 0.2, 1),
             box-shadow .2s ease,
             border-color .2s ease;
}

/* 浅色主题卡片渐变修复 */
[data-theme="light"] .card{
  background:linear-gradient(135deg, var(--surface) 0%, color-mix(in oklab, var(--surface), var(--primary) 3%) 100%);
}
.card:hover{
  transform:translateY(-6px) scale(1.01);
  box-shadow:var(--shadow-elevated), 0 0 0 1px rgba(95,163,255,.12);
  border-color:rgba(106,169,255,.35);
}
.card.highlight{
  outline:2px solid color-mix(in oklab, var(--primary), white 20%);
  background:linear-gradient(135deg, 
    color-mix(in oklab, var(--surface), var(--primary) 5%) 0%,
    var(--surface) 100%);
}
.card h3{margin:8px 0 12px 0;font-size:20px;font-weight:600} /* 优化标题 */
.card ul{margin:0 0 0 20px;line-height:1.8}

/* Stats - 优化视觉层次 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:24px}
.stat{
  background:linear-gradient(135deg, var(--surface) 0%, var(--bg-secondary) 100%);
  border:1px solid var(--border);
  border-radius:16px;
  padding:24px 18px;
  text-align:center;
  transition:transform .2s ease, box-shadow .2s ease;
}
.stat:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-elevated);
}
.stat .num{
  font-size:32px;
  font-weight:800;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  line-height:1.2;
}
.stat .label{color:var(--muted);font-size:14px;margin-top:6px}

/* Timeline - 优化视觉 */
.timeline{list-style:none;margin:0;padding:0;position:relative}
.timeline:before{
  content:"";
  position:absolute;
  left:18px;
  top:0;
  bottom:0;
  width:3px;
  background:linear-gradient(180deg, var(--border), rgba(106,169,255,.3), var(--border));
  border-radius:3px;
}
.timeline-item{
  position:relative;
  padding-left:56px;
  margin-bottom:32px;
}
.timeline-item:before{
  content:"";
  position:absolute;
  left:10px;
  top:.7em;
  width:20px;
  height:20px;
  border-radius:50%;
  background:var(--primary);
  border:3px solid var(--surface);
  box-shadow:0 0 0 2px var(--primary), 0 2px 8px rgba(106,169,255,.4);
  z-index:1;
}
.timeline .time{
  font-family:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color:var(--primary);
  font-size:14px;
  font-weight:600;
  letter-spacing:.3px;
}
.timeline-item .content h4{
  margin:4px 0 8px 0;
  font-size:18px;
  font-weight:600;
}

/* Lists - 优化间距和视觉 */
ul.check{list-style:none;padding-left:0}
ul.check li{
  padding-left:32px;
  position:relative;
  margin:10px 0;
  line-height:1.7;
}
ul.check li:before{
  content:"✓";
  position:absolute;
  left:0;
  top:0;
  color:var(--success);
  font-weight:700;
  font-size:16px;
}
ul.disc{padding-left:20px;line-height:1.75}
ul.disc li{margin:8px 0}

/* Steps - 优化视觉 */
.steps{counter-reset:step;padding-left:0;list-style:none}
.steps li{
  counter-increment:step;
  margin:16px 0 16px 42px;
  position:relative;
  line-height:1.7;
}
.steps li:before{
  content:counter(step);
  position:absolute;
  left:-42px;
  top:0;
  width:28px;
  height:28px;
  border-radius:50%;
  background:linear-gradient(135deg, var(--primary), var(--accent));
  color:#fff;
  font-size:14px;
  font-weight:700;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 2px 8px rgba(106,169,255,.3);
}

/* Footer - 优化 */
.site-footer{
  border-top:1px solid var(--border);
  padding:32px 0;
  color:var(--muted);
  background:linear-gradient(180deg, transparent, var(--bg-secondary));
}
.site-footer .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px;
}
.site-footer nav{display:flex;gap:8px}
.site-footer nav a{
  color:var(--muted);
  text-decoration:none;
  padding:6px 12px;
  border-radius:8px;
  transition:all .2s;
}
.site-footer nav a:hover{
  color:var(--text);
  background:rgba(255,255,255,.06);
}

/* Back To Top - 优化视觉 */
.back-to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  width:48px;
  height:48px;
  border-radius:50%;
  border:1px solid var(--border);
  background:linear-gradient(135deg, var(--surface), var(--bg-secondary));
  color:var(--text);
  font-size:20px;
  box-shadow:var(--shadow);
  display:none;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  transition:transform .2s ease, box-shadow .2s ease, background .2s ease;
  opacity:0;
}
.back-to-top.show{
  display:flex;
  opacity:1;
}
.back-to-top:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-elevated);
  background:linear-gradient(135deg, var(--primary), var(--accent));
  color:#fff;
}

/* Prize highlight */
.prize{
  font-weight:800;
  font-size:24px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  letter-spacing:.5px;
}

/* Tables - 优化奖项表格排版 */
.table-wrap{
  border:1px solid var(--border);
  border-radius:14px;
  overflow:auto;
  background:linear-gradient(135deg, var(--surface) 0%, var(--bg-secondary) 100%);
  box-shadow:var(--shadow);
}
.table{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
.table thead th{
  text-align:left;
  padding:12px 16px;
  font-weight:700;
  letter-spacing:.2px;
  background:linear-gradient(180deg, color-mix(in oklab, var(--primary), transparent 86%), transparent);
}
.table th, .table td{padding:12px 16px}
.table tbody td{border-top:1px solid var(--border)}
.table tbody tr:nth-child(even){background:color-mix(in oklab, var(--surface), white 2%)}
[data-theme="light"] .table tbody tr:nth-child(even){background:color-mix(in oklab, #ffffff, var(--bg) 3%)}
.table tbody tr:hover{background:color-mix(in oklab, var(--surface), white 4%)}
.table .num{text-align:center;font-variant-numeric:tabular-nums;white-space:nowrap}
.table .center{text-align:center}
.table .muted{color:var(--muted)}

/* 更紧凑的表格与窄宽度包装（用于 Litex 特别奖） */
.table-wrap.narrow{max-width:760px;margin:0 auto}
.table.compact th, .table.compact td{padding:8px 12px}
.table.compact th:nth-child(2),
.table.compact td:nth-child(2),
.table.compact th:nth-child(3),
.table.compact td:nth-child(3){
  text-align:center;
  padding-left:12px;
  padding-right:12px;
}

/* 分隔线 */
hr{
  border:none;
  height:1px;
  background:linear-gradient(90deg, transparent, var(--border), transparent);
  margin:32px 0;
}

/* 代码块样式 */
pre{
  background:var(--bg-secondary);
  border:1px solid var(--border);
  border-radius:12px;
  padding:20px;
  overflow-x:auto;
  font-family:"JetBrains Mono", ui-monospace, monospace;
  font-size:13px;
  line-height:1.6;
}
pre code{
  color:var(--text);
}

/* Forms - 增强表单体验 */
.subscribe{display:flex;gap:12px;align-items:center;margin-top:12px;flex-wrap:wrap}
.subscribe input{
  flex:1;
  min-width:240px;
  background:var(--surface);
  border:1.5px solid var(--border);
  border-radius:12px;
  padding:12px 16px;
  color:var(--text);
  font-size:15px;
  transition:border-color .2s ease, box-shadow .2s ease, padding-right .2s ease;
}
.subscribe input:focus{
  outline:none;
  border-color:var(--primary);
  box-shadow:0 0 0 3px color-mix(in oklab, var(--primary), transparent 85%);
}
/* 实时验证视觉反馈 */
.subscribe input.valid{
  border-color:var(--success);
  padding-right:42px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%233ee0a8' stroke-width='3' stroke-linecap='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat:no-repeat;
  background-position:right 14px center;
}
.subscribe input.invalid{
  border-color:var(--warning);
  padding-right:42px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23ffd666' stroke-width='3' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='10'%3E%3C/circle%3E%3Cline x1='12' y1='8' x2='12' y2='12'%3E%3C/line%3E%3Cline x1='12' y1='16' x2='12.01' y2='16'%3E%3C/line%3E%3C/svg%3E");
  background-repeat:no-repeat;
  background-position:right 14px center;
}
.subscribe .help{
  margin-left:4px;
  color:var(--muted);
  font-size:14px;
  transition:color .2s ease;
  font-weight:500;
}

/* Reveal on scroll */
.reveal{opacity:0;transform:translateY(10px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* FAQ - 优化交互 */
details.faq{
  background:linear-gradient(135deg, var(--surface) 0%, var(--bg-secondary) 100%);
  border:1px solid var(--border);
  border-radius:14px;
  padding:18px 20px;
  margin:14px 0;
  transition:all .2s ease;
  cursor:pointer;
}
details.faq:hover{
  border-color:rgba(95,163,255,.3);
  box-shadow:0 4px 12px rgba(23,32,54,.20);
}
details.faq[open]{
  border-color:var(--primary);
  background:linear-gradient(135deg, var(--surface) 0%, rgba(106,169,255,.05) 100%);
}
details.faq summary{
  font-weight:600;
  font-size:16px;
  line-height:1.6;
  user-select:none;
  outline:none;
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary:before{
  content:"▸";
  display:inline-block;
  margin-right:10px;
  color:var(--primary);
  transition:transform .2s ease;
}
details.faq[open] summary:before{
  transform:rotate(90deg);
}
details.faq p{
  margin:12px 0 4px 0;
  line-height:1.7;
  color:var(--muted);
}

/* Responsive */
@media (max-width: 1024px){
  .grid.cards.three{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 800px){
  .section{padding:64px 0}
  .grid.two,.grid.cards{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .headline{font-size:30px}
  .headline span{font-size:38px}
  .nav-toggle{display:block}
  .nav-menu{position:absolute;top:64px;right:20px;background:var(--surface);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:0;overflow:hidden;max-height:0;transition:max-height .3s ease}
  .nav-menu.open{max-height:340px}
  .nav-menu li{border-bottom:1px solid var(--border)}
  .nav-menu a{display:block;padding:12px 14px}
}
@media (max-width: 520px){
  .stats{grid-template-columns:1fr}
  .headline{font-size:26px}
  .headline span{font-size:32px}
}

/* Fluid Typography */
:root{--fs-sm: clamp(14px, 0.9vw, 16px);--fs-md: clamp(16px, 1.2vw, 18px);--fs-lg: clamp(22px, 3.5vw, 36px);--fs-xl: clamp(28px, 4.5vw, 48px)}
.section-title{font-size:var(--fs-lg)}
.lead{font-size:var(--fs-md)}
.headline{font-size:calc(var(--fs-lg) + 4px)}
.headline span{font-size:var(--fs-xl)}

/* Focus states */
:where(a, button, input, summary, .btn):focus-visible{outline:2px solid color-mix(in oklab, var(--primary), white 25%);outline-offset:2px;border-radius:10px}

/* Leaderboard Switch Buttons */
.leaderboard-switch{display:flex;justify-content:center;gap:12px;margin-bottom:16px}
.btn-switch{
  padding:8px 24px;
  border:2px solid var(--border);
  background:transparent;
  color:var(--muted);
  border-radius:8px;
  cursor:pointer;
  font-size:14px;
  font-weight:500;
  transition:all 0.3s ease;
}
.btn-switch:hover{
  border-color:var(--primary);
  color:var(--text);
  background:rgba(var(--primary-rgb),.1);
}
.btn-switch.active{
  border-color:var(--primary);
  background:var(--primary);
  color:#fff;
  box-shadow:0 4px 12px rgba(47,128,255,.3);
}

/* 排行榜表格优化间距 */
.leaderboard-table th,
.leaderboard-table td{
  padding:12px 16px;
}
.leaderboard-table tbody tr{
  transition:background-color 0.2s ease;
}

/* 分页控件 */
.pagination-container{
  margin-top:24px;
}
.pagination{
  display:flex;
  justify-content:center;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}
.pagination-btn{
  min-width:40px;
  height:40px;
  padding:0 12px;
  border:1px solid var(--border);
  background:var(--surface);
  color:var(--text);
  border-radius:8px;
  cursor:pointer;
  font-size:14px;
  font-weight:500;
  transition:all 0.2s ease;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}
.pagination-btn:hover{
  border-color:var(--primary);
  background:color-mix(in oklab, var(--primary), transparent 88%);
  color:var(--primary);
}
.pagination-btn.active{
  border-color:var(--primary);
  background:var(--primary);
  color:#fff;
  cursor:default;
}
.pagination-btn:disabled{
  opacity:0.5;
  cursor:not-allowed;
}
.pagination-ellipsis{
  padding:0 8px;
  color:var(--muted);
  font-size:14px;
}

/* Scroll progress bar */
.scroll-progress{position:fixed;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--primary),var(--accent));z-index:60;box-shadow:var(--shadow)}

/* Card hover polish - 已合并到上方 .card 定义 */

/* Subtle section dividers */
.section{position:relative}
.section:after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg, transparent, var(--border), transparent)}
.section.alt:after{opacity:.4}

/* Header shadow on scroll */
.site-header.scrolled{box-shadow:0 8px 20px rgba(23,32,54,.28)}

/* Overlay for mobile menu */
.nav-overlay{display:none}
.nav-overlay.show{display:block;position:fixed;inset:0;background:rgba(23,32,54,.30);backdrop-filter:blur(2px);z-index:40}

/* Selection color */
::selection{background:color-mix(in oklab, var(--primary), white 22%);color:#0a0b10}

/* Anchor offset helper */
:target{scroll-margin-top:84px}