/* ============================================================
   Clash 客户端官网 · 2026 亮色系视觉主题
   清透蓝 × 薄荷青 · 自然 / 通透 / 低饱和
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --p1:#2f8fef;
  --p2:#1fb8a0;
  --p1-soft:#eaf4fe;
  --p2-soft:#e9f9f5;
  --lilac-soft:#f0eeff;
  --lilac:#7c6bf0;
  --amber-soft:#fdf3e3;
  --amber:#e0952f;

  --ink:#12263f;
  --ink-2:#33506e;
  --ink-3:#5a7290;
  --ink-4:#8ba3bd;

  --line:#e2eef9;
  --line-2:#d3e5f6;

  --bg:#ffffff;
  --bg-soft:#f5faff;
  --bg-mint:#f1fbf8;

  --grad:linear-gradient(100deg,#2f8fef 0%,#1fb8a0 100%);
  --grad-soft:linear-gradient(100deg,#eaf4fe,#e9f9f5);

  --shadow:0 14px 34px -18px rgba(35,95,160,.28);
  --shadow-hover:0 22px 46px -20px rgba(35,95,160,.34);

  --radius:16px;
  --radius-sm:12px;
  --ease:.25s cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{text-decoration:none;color:inherit;transition:color var(--ease);}
ul{list-style:none;}
img{max-width:100%;display:block;}
button{font-family:inherit;cursor:pointer;}
::selection{background:rgba(47,143,239,.18);}

.container{max-width:1120px;margin:0 auto;padding:0 22px;}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;font-size:15px;font-weight:600;
  border-radius:999px;cursor:pointer;
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease),color var(--ease);
  white-space:nowrap;border:2px solid transparent;
}
.btn-primary{
  background:var(--grad);color:#fff;
  border-color:transparent;
  box-shadow:0 18px 36px -16px rgba(47,143,239,.9);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 24px 42px -16px rgba(47,143,239,1);}
.btn-outline{
  background:#fff;color:var(--p1);
  border-color:var(--line-2);
  box-shadow:0 10px 24px -18px rgba(35,95,160,.7);
}
.btn-outline:hover{border-color:var(--p1);transform:translateY(-2px);}

/* ============================================================
   导航
   ============================================================ */
.sb-nav{
  position:sticky;top:0;z-index:90;
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.sb-nav-inner{
  max-width:1200px;margin:0 auto;padding:0 22px;height:66px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.sb-logo{
  display:flex;align-items:center;gap:11px;
  color:var(--ink);font-weight:800;font-size:17px;letter-spacing:.2px;
}

/* === Logo 图片 === */
.sb-logo-img{
  width:32px;
  height:32px;
  border-radius:10px;
  object-fit:cover;
  background:#fff;
  box-shadow:0 10px 22px -10px rgba(47,143,239,.85);
  flex-shrink:0;
}
.sb-logo span small{
  display:block;font-size:10px;font-weight:600;letter-spacing:1.6px;
  color:var(--ink-4);text-transform:uppercase;margin-top:1px;
}
.sb-nav-links{display:flex;align-items:center;gap:26px;}
.sb-nav-links a{
  color:var(--ink-3);font-size:14.5px;font-weight:500;
}
.sb-nav-links a:hover{color:var(--p1);}
.sb-nav-cta{
  display:inline-flex;align-items:center;gap:7px;
  padding:10px 20px;border-radius:999px;
  font-size:14px;font-weight:700;color:#fff;
  background:var(--grad);
  box-shadow:0 14px 28px -14px rgba(47,143,239,.9);
  transition:transform var(--ease),box-shadow var(--ease);
}
.sb-nav-cta:hover{transform:translateY(-1px);box-shadow:0 18px 32px -14px rgba(47,143,239,1);}

/* ============================================================
   Hero
   ============================================================ */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 520px at 14% -12%,rgba(47,143,239,.15) 0%,transparent 62%),
    radial-gradient(820px 480px at 88% -8%,rgba(31,184,160,.14) 0%,transparent 60%),
    linear-gradient(180deg,#f8fcff 0%,#eef8fd 100%);
  color:var(--ink);
  text-align:center;
  padding:90px 20px 210px;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--line-2);
  color:var(--p1);font-weight:600;font-size:12px;
  padding:6px 16px;border-radius:999px;
  margin-bottom:24px;
  box-shadow:0 8px 20px -14px rgba(35,95,160,.6);
}
.hero-title{
  font-size:52px;font-weight:700;
  color:var(--ink);letter-spacing:-.5px;
  max-width:820px;margin:0 auto 36px;line-height:1.25;
}
.hero-title-brand{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-title-sub{
  display:block;font-size:.55em;font-weight:600;
  color:var(--ink-2);margin-top:12px;letter-spacing:.02em;
}
.hero-buttons{
  display:flex;justify-content:center;gap:12px;
  margin-bottom:52px;flex-wrap:wrap;
}
.hero-platforms{margin-bottom:0;}
.hero-platforms-label{
  font-size:11px;letter-spacing:2.4px;font-weight:600;
  color:var(--ink-4);text-transform:uppercase;margin-bottom:14px;
}
.platform-tabs{
  display:inline-flex;gap:10px;flex-wrap:wrap;justify-content:center;
}
.platform-tab{
  display:flex;flex-direction:column;align-items:center;gap:6px;
  padding:12px 20px;min-width:84px;
  background:#fff;border:1px solid var(--line);
  border-radius:12px;color:var(--ink-3);
  font-size:12px;line-height:1;
  box-shadow:0 6px 16px -12px rgba(35,95,160,.55);
  transition:all var(--ease);
}
.platform-tab i{font-size:22px;color:var(--ink-4);transition:color var(--ease);}
.platform-tab:hover{
  border-color:var(--p1);color:var(--p1);
  background:var(--p1-soft);transform:translateY(-2px);
}
.platform-tab:hover i{color:var(--p1);}

.hero-graphic{
  position:absolute;left:0;right:0;bottom:0;
  width:100%;display:block;opacity:.9;pointer-events:none;
}

/* ============================================================
   概览区
   ============================================================ */
.overview-section{
  position:relative;
  background:var(--bg-soft);
  padding:76px 22px 100px;
  text-align:center;
}
.overview-title{
  font-size:24px;font-weight:500;
  color:var(--ink);letter-spacing:-.3px;
  margin-bottom:40px;
}
.overview-grid{
  display:flex;justify-content:center;gap:20px;
  max-width:960px;margin:0 auto;flex-wrap:wrap;
}
.overview-card{
  position:relative;overflow:hidden;
  background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);
  padding:48px 30px;
  flex:1;min-width:260px;
  display:flex;flex-direction:column;align-items:center;
  box-shadow:var(--shadow);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.overview-card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:var(--grad);opacity:0;transition:opacity var(--ease);
}
.overview-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
  border-color:var(--line-2);
}
.overview-card:hover::before{opacity:1;}
.card-icon{
  width:52px;height:52px;border-radius:14px;
  display:grid;place-items:center;
  font-size:20px;color:var(--p1);background:var(--p1-soft);
  margin-bottom:20px;
}
.overview-card:nth-child(2) .card-icon{color:var(--p2);background:var(--p2-soft);}
.overview-card:nth-child(3) .card-icon{color:var(--lilac);background:var(--lilac-soft);}
.card-title{font-size:18px;font-weight:600;color:var(--ink);margin-bottom:10px;}
.card-desc{font-size:13.5px;color:var(--ink-3);line-height:1.7;margin-bottom:18px;}
.card-link{font-size:13.5px;font-weight:600;color:var(--p1);margin-top:auto;}
.card-link:hover{color:var(--p2);}

.section-arrow-down{
  position:absolute;left:50%;bottom:0;
  width:46px;height:46px;
  background:var(--bg-soft);
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  transform:translate(-50%,50%) rotate(45deg);
  z-index:10;
}
.section-arrow-down i{
  position:absolute;right:12px;bottom:12px;
  transform:rotate(-45deg);
  color:var(--ink-4);font-size:16px;
}

/* ============================================================
   通用版块头
   ============================================================ */
.section-head{text-align:center;margin-bottom:52px;}
.section-head h2{
  font-size:clamp(24px,3vw,34px);
  font-weight:600;color:var(--ink);
  letter-spacing:-.4px;margin-bottom:14px;line-height:1.3;
}
.section-head p{
  font-size:15.5px;color:var(--ink-3);
  max-width:720px;margin:0 auto;line-height:1.85;
}
.section-label{
  font-size:11px;font-weight:700;letter-spacing:2.6px;
  text-transform:uppercase;color:var(--p1);margin-bottom:14px;
}

/* ============================================================
   核心能力
   ============================================================ */
.features-section{background:#fff;padding:100px 22px 88px;}
.features-grid{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:20px;max-width:1000px;margin:0 auto;
}
.feature-item{
  display:flex;align-items:flex-start;gap:18px;
  padding:26px;
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:transform var(--ease),box-shadow var(--ease),background var(--ease),border-color var(--ease);
}
.feature-item:hover{
  background:#fff;border-color:var(--line-2);
  box-shadow:var(--shadow);transform:translateY(-3px);
}
.feature-icon{
  flex-shrink:0;width:48px;height:48px;border-radius:13px;
  display:grid;place-items:center;
  font-size:18px;color:var(--p1);background:var(--p1-soft);
}
.feature-item:nth-child(2) .feature-icon{color:var(--p2);background:var(--p2-soft);}
.feature-item:nth-child(3) .feature-icon{color:var(--lilac);background:var(--lilac-soft);}
.feature-item:nth-child(4) .feature-icon{color:var(--amber);background:var(--amber-soft);}
.feature-text h3{font-size:18px;font-weight:600;color:var(--ink);margin-bottom:10px;}
.feature-text p{font-size:14px;color:var(--ink-3);line-height:1.75;}

/* ============================================================
   对比表
   ============================================================ */
.compare-section{background:var(--bg-soft);padding:88px 22px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.compare-table{
  max-width:1120px;margin:0 auto;
  border:1px solid var(--line);border-radius:20px;
  overflow:hidden;background:#fff;
  box-shadow:var(--shadow);
}
.compare-row{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;
  border-bottom:1px solid var(--line);
}
.compare-row:last-child{border-bottom:none;}
.compare-row.head{background:var(--grad-soft);font-weight:700;}
.compare-cell{
  padding:16px 18px;font-size:14.5px;color:var(--ink-3);
  display:flex;align-items:center;gap:9px;
  border-right:1px solid var(--line);
}
.compare-cell:last-child{border-right:none;}
.compare-row.head .compare-cell{color:var(--ink);}
.compare-cell .col-name{font-weight:600;color:var(--ink);font-size:15px;}
.compare-cell.hl{
  background:var(--p1-soft);color:var(--ink-2);font-weight:600;
}
.compare-row.head .compare-cell.hl{
  background:linear-gradient(100deg,rgba(47,143,239,.16),rgba(31,184,160,.16));
  color:var(--p1);
}
.yes{color:#17a673;font-weight:700;}
.no{color:#b7c7d8;font-weight:600;}
.part{color:#d99530;font-weight:600;}

/* ============================================================
   数据带
   ============================================================ */
.stats-section{
  background:linear-gradient(120deg,#eef8ff 0%,#e9f9f5 55%,#f2f7ff 100%);
  border-bottom:1px solid var(--line);
}
.stats-inner{display:flex;max-width:1000px;margin:0 auto;padding:0 22px;}
.stat-item{
  flex:1;padding:56px 20px;text-align:center;
  border-right:1px solid var(--line);
}
.stat-item:last-child{border-right:none;}
.stat-num{
  font-size:54px;font-weight:800;letter-spacing:-2px;line-height:1;
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  margin-bottom:12px;font-variant-numeric:tabular-nums;
}
.stat-suffix{font-size:38px;font-weight:800;}
.stat-label{
  font-size:12px;font-weight:600;letter-spacing:1.8px;
  text-transform:uppercase;color:var(--ink-3);
}

/* ============================================================
   全协议矩阵
   ============================================================ */
.protocols-section{background:#fff;padding:100px 22px;}
.protocols-layout{
  display:grid;grid-template-columns:1fr 1.4fr;
  gap:70px;align-items:center;
  max-width:1120px;margin:0 auto;
}
.protocols-left h2{
  font-size:34px;font-weight:600;line-height:1.35;
  color:var(--ink);letter-spacing:-.3px;margin-bottom:20px;
}
.protocols-left p{font-size:15px;color:var(--ink-3);line-height:1.85;}
.protocol-list{
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:8px 0;box-shadow:var(--shadow);
}
.protocol-row{
  display:flex;align-items:center;gap:16px;
  padding:16px 22px;
  border-bottom:1px solid var(--line);
  transition:background var(--ease);
}
.protocol-row:last-child{border-bottom:none;}
.protocol-row:hover{background:#fff;}
.protocol-badge{
  width:42px;height:42px;border-radius:10px;
  display:grid;place-items:center;
  font-size:18px;
  color:#fff;background:var(--grad);flex-shrink:0;
  box-shadow:0 8px 18px -10px rgba(47,143,239,.85);
}
.protocol-info{flex:1;min-width:0;}
.protocol-info strong{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:3px;}
.protocol-info span{font-size:12.5px;color:var(--ink-4);line-height:1.45;}
.protocol-check{color:var(--p2);font-size:15px;flex-shrink:0;}

/* ============================================================
   订阅管理
   ============================================================ */
.subscription-section{
  background:var(--bg-mint);
  padding:88px 22px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.sub-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:20px;max-width:1120px;margin:0 auto;
}
.sub-card{
  background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:26px 24px;
  box-shadow:0 10px 28px -20px rgba(35,95,160,.5);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.sub-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--line-2);}
.sub-ico{
  width:46px;height:46px;border-radius:13px;
  display:grid;place-items:center;font-size:18px;
  background:var(--p1-soft);color:var(--p1);margin-bottom:16px;
}
.sub-card:nth-child(2) .sub-ico{background:var(--p2-soft);color:var(--p2);}
.sub-card:nth-child(3) .sub-ico{background:var(--lilac-soft);color:var(--lilac);}
.sub-card:nth-child(4) .sub-ico{background:var(--amber-soft);color:var(--amber);}
.sub-card h4{font-size:16.5px;color:var(--ink);margin-bottom:9px;}
.sub-card p{font-size:14px;color:var(--ink-3);line-height:1.8;}
.sub-note{
  max-width:1120px;margin:34px auto 0;
  text-align:center;font-size:13.5px;color:var(--ink-4);
}

/* ============================================================
   使用场景
   ============================================================ */
.scenarios-section{background:var(--bg-soft);padding:100px 22px;}
.scenario-block{
  display:grid;grid-template-columns:110px 1fr;gap:40px;
  max-width:920px;margin:0 auto 64px;padding-bottom:64px;
  border-bottom:1px solid var(--line);
}
.scenario-block:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0;}
.scenario-number{
  font-size:80px;font-weight:800;line-height:1;letter-spacing:-4px;
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-align:right;padding-top:6px;user-select:none;
}
.scenario-content h3{font-size:21px;font-weight:600;color:var(--ink);margin-bottom:14px;line-height:1.45;}
.scenario-content p{font-size:15px;color:var(--ink-3);line-height:1.85;margin-bottom:22px;}
.scenario-tags{display:flex;flex-wrap:wrap;gap:8px;}
.scenario-tags li{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12.5px;background:#fff;border:1px solid var(--line);
  padding:6px 14px;border-radius:20px;
  color:var(--ink-2);font-weight:500;
}
.scenario-tags li i{color:var(--p1);font-size:11px;}

/* ============================================================
   下载
   ============================================================ */
.downloads-section{background:#fff;padding:100px 22px 88px;}
.downloads-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:18px;max-width:1120px;margin:0 auto;
}
.download-card{
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:30px 22px;text-align:center;
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease),background var(--ease);
}
.download-card:hover{
  background:#fff;border-color:var(--line-2);
  box-shadow:var(--shadow-hover);transform:translateY(-4px);
}
.download-card i{font-size:38px;color:var(--p1);margin-bottom:18px;}
.download-card h4{font-size:16px;font-weight:600;color:var(--ink);margin-bottom:8px;}
.download-card p{font-size:12.5px;color:var(--ink-4);margin-bottom:18px;}
.btn-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--p1);
}
.btn-link i{font-size:12px;margin:0;}
.btn-link:hover{color:var(--p2);}

/* ============================================================
   系统要求
   ============================================================ */
.requirements-section{
  background:var(--bg-soft);padding:88px 22px;
  border-top:1px solid var(--line);
}
.req-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:16px;max-width:1120px;margin:0 auto;
}
.req-item{
  background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:22px 20px;
  box-shadow:0 8px 24px -20px rgba(35,95,160,.5);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.req-item:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--line-2);}
.req-item .ri-top{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.req-item .ri-top i{font-size:20px;color:var(--p1);}
.req-item:nth-child(2) .ri-top i{color:var(--ink-2);}
.req-item:nth-child(3) .ri-top i{color:var(--p2);}
.req-item:nth-child(4) .ri-top i{color:var(--lilac);}
.req-item:nth-child(5) .ri-top i{color:var(--amber);}
.req-item h4{font-size:15.5px;color:var(--ink);}
.req-list li{
  display:flex;justify-content:space-between;gap:10px;
  font-size:13.5px;color:var(--ink-3);
  padding:7px 0;border-bottom:1px dashed var(--line);
}
.req-list li:last-child{border-bottom:none;}
.req-list li b{color:var(--ink-2);font-weight:600;}

/* ============================================================
   三步上手
   ============================================================ */
.quickstart-section{background:#fff;padding:100px 22px;}
.qs-timeline{max-width:780px;margin:0 auto;}
.qs-step{display:grid;grid-template-columns:80px 1fr;gap:32px;}
.qs-step-left{display:flex;flex-direction:column;align-items:center;}
.qs-num{
  width:54px;height:54px;border-radius:50%;
  display:grid;place-items:center;
  font-size:15px;font-weight:800;color:#fff;
  background:var(--grad);flex-shrink:0;
  box-shadow:0 10px 22px -12px rgba(47,143,239,.9);
}
.qs-line{
  width:2px;flex:1;min-height:50px;margin:10px 0;
  background:linear-gradient(180deg,rgba(47,143,239,.45),rgba(31,184,160,.18));
}
.qs-step-right{padding-bottom:64px;min-width:0;}
.qs-step:last-child .qs-step-right{padding-bottom:0;}
.qs-step-right h3{font-size:20px;font-weight:600;color:var(--ink);margin-bottom:12px;margin-top:14px;line-height:1.4;}
.qs-step-right p{font-size:14px;color:var(--ink-3);line-height:1.85;margin-bottom:18px;}
.qs-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--p1);
  transition:gap var(--ease),color var(--ease);
}
.qs-link:hover{gap:11px;color:var(--p2);}
.qs-code-block{
  background:#f7fbff;border:1px solid var(--line);border-left:3px solid var(--p1);
  border-radius:12px;padding:18px 22px;
  font-family:'Courier New','Consolas',monospace;
  font-size:13px;line-height:2;color:var(--ink-2);margin-top:14px;
}
.code-key{color:var(--p1);font-weight:600;}
.code-val{color:#0f9d78;}
.code-comment{color:var(--ink-4);}

/* ============================================================
   用户反馈
   ============================================================ */
.testimonials-section{
  background:var(--bg-soft);padding:88px 22px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.tm-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));
  gap:20px;max-width:1120px;margin:0 auto;
}
.tm-card{
  display:flex;flex-direction:column;gap:16px;
  background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:26px 24px;
  box-shadow:0 10px 28px -22px rgba(35,95,160,.55);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.tm-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--line-2);}
.tm-stars{color:#f5b53d;font-size:13px;letter-spacing:2px;}
.tm-text{font-size:14.5px;color:var(--ink-2);line-height:1.9;}
.tm-user{display:flex;align-items:center;gap:12px;margin-top:auto;}
.tm-avatar{
  width:38px;height:38px;border-radius:50%;
  display:grid;place-items:center;
  font-size:16px;font-weight:700;color:#fff;
  background:var(--grad);flex-shrink:0;
}
.tm-card:nth-child(2) .tm-avatar{background:linear-gradient(120deg,#7c6bf0,#2f8fef);}
.tm-card:nth-child(3) .tm-avatar{background:linear-gradient(120deg,#1fb8a0,#2f8fef);}
.tm-card:nth-child(4) .tm-avatar{background:linear-gradient(120deg,#e0952f,#1fb8a0);}
.tm-meta strong{display:block;font-size:14px;color:var(--ink);}
.tm-meta span{font-size:12.5px;color:var(--ink-4);}

/* ============================================================
   FAQ
   ============================================================ */
.faq-section{background:#fff;padding:100px 22px;}
.faq-grid{max-width:860px;margin:0 auto 48px;}
.faq-item{
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:14px;margin-bottom:12px;
  transition:border-color var(--ease),background var(--ease),box-shadow var(--ease);
}
.faq-item:hover{border-color:var(--line-2);background:#fff;}
.faq-item.open{
  border-color:rgba(47,143,239,.45);background:#fff;
  box-shadow:0 10px 28px -22px rgba(35,95,160,.6);
}
.faq-question{
  width:100%;background:none;border:none;
  padding:22px 24px;
  display:flex;justify-content:space-between;align-items:center;gap:20px;
  font-size:16px;font-weight:600;color:var(--ink);
  text-align:left;transition:color var(--ease);
}
.faq-question:hover{color:var(--p1);}
.faq-icon{
  font-size:14px;color:var(--p1);flex-shrink:0;
  transition:transform .28s ease;
}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-answer{
  overflow:hidden;max-height:0;
  transition:max-height .38s ease;
}
.faq-answer.open{max-height:420px;}
.faq-answer p{
  padding:0 24px 24px;
  font-size:14px;color:var(--ink-3);line-height:1.85;
}
.faq-answer strong{color:var(--ink);}
.faq-more{text-align:center;}

/* ============================================================
   资源导航
   ============================================================ */
.resources-section{background:var(--bg-soft);padding:88px 22px;border-top:1px solid var(--line);}
.res-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:18px;max-width:1120px;margin:0 auto;
}
.res-card{
  display:block;background:#fff;
  border:1px solid var(--line);
  border-radius:14px;padding:24px 22px;
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.res-card:hover{
  border-color:var(--line-2);
  box-shadow:var(--shadow-hover);transform:translateY(-4px);
}
.res-card .rc-top{display:flex;align-items:center;gap:11px;margin-bottom:12px;}
.res-card .rc-ico{
  width:40px;height:40px;border-radius:11px;
  display:grid;place-items:center;font-size:16px;
  background:var(--p1-soft);color:var(--p1);flex-shrink:0;
}
.res-card:nth-child(2) .rc-ico{background:var(--p2-soft);color:var(--p2);}
.res-card:nth-child(3) .rc-ico{background:var(--lilac-soft);color:var(--lilac);}
.res-card:nth-child(4) .rc-ico{background:var(--amber-soft);color:var(--amber);}
.res-card:nth-child(5) .rc-ico{background:var(--p1-soft);color:var(--p1);}
.res-card:nth-child(6) .rc-ico{background:var(--p2-soft);color:var(--p2);}
.res-card h4{font-size:15.5px;color:var(--ink);margin-bottom:8px;}
.res-card p{font-size:13.5px;color:var(--ink-3);line-height:1.75;}
.res-card .rc-more{
  display:inline-flex;align-items:center;gap:6px;
  margin-top:14px;font-size:13.5px;font-weight:600;color:var(--p1);
}
.res-card:hover .rc-more{color:var(--p2);}

/* ============================================================
   开源社区横幅
   ============================================================ */
.community-section{
  background:
    radial-gradient(800px 400px at 12% 0%,rgba(47,143,239,.16) 0%,transparent 62%),
    radial-gradient(700px 380px at 92% 10%,rgba(31,184,160,.15) 0%,transparent 60%),
    linear-gradient(120deg,#f2f9ff 0%,#eaf9f5 55%,#f5f8ff 100%);
  border-top:1px solid var(--line);
}
.community-inner{
  max-width:1120px;margin:0 auto;padding:80px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:48px;
}
.community-text h2{font-size:30px;font-weight:600;color:var(--ink);margin:12px 0 14px;letter-spacing:-.3px;}
.community-text p{color:var(--ink-3);max-width:540px;line-height:1.85;font-size:15px;}
.community-btn{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  background:#fff;color:var(--ink);
  border:1px solid var(--line-2);
  padding:26px 44px;border-radius:14px;text-align:center;
  box-shadow:0 16px 36px -22px rgba(35,95,160,.7);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
  flex-shrink:0;min-width:200px;
}
.community-btn:hover{
  transform:translateY(-3px);border-color:var(--p1);
  box-shadow:0 22px 44px -22px rgba(47,143,239,.9);
}
.community-btn i{font-size:28px;color:var(--ink);}
.community-btn span{font-size:15px;font-weight:700;}
.community-btn small{font-size:12px;color:var(--ink-4);}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:
    radial-gradient(700px 320px at 8% 0%, rgba(47,143,239,.08) 0%, transparent 62%),
    radial-gradient(600px 300px at 92% 0%, rgba(31,184,160,.07) 0%, transparent 60%),
    linear-gradient(180deg,#ffffff 0%,#f5faff 100%);
  border-top:1px solid var(--line);
  padding:64px 0 26px;
  color:var(--ink);
  font-size:14px;
}
.footer-inner{
  max-width:1120px;
  margin:0 auto;
  padding:0 22px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:42px;
  border-bottom:1px solid var(--line);
}
.footer-brand{
  display:inline-flex;align-items:center;gap:10px;
  font-size:17px;font-weight:800;color:var(--ink);
  margin-bottom:14px;
}
.footer-brand-img{
  width:30px;
  height:30px;
  border-radius:9px;
  object-fit:cover;
  background:#fff;
  box-shadow:0 10px 22px -10px rgba(47,143,239,.85);
  flex-shrink:0;
}
.footer-brand:hover{color:var(--p1);}
.footer-desc{
  font-size:13.5px;line-height:1.85;
  color:var(--ink-3);max-width:340px;
  margin-bottom:18px;
}
.footer-gh{
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 14px;border-radius:999px;
  background:#fff;border:1px solid var(--line);
  font-size:13px;font-weight:600;color:var(--ink-2);
  transition:border-color var(--ease),color var(--ease),transform var(--ease);
}
.footer-gh i{color:var(--ink);}
.footer-gh:hover{
  border-color:var(--p1);color:var(--p1);
  transform:translateY(-1px);
}
.footer-col h4{
  font-size:13.5px;font-weight:700;
  color:var(--ink);margin-bottom:16px;
  letter-spacing:.2px;
}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col ul a{
  display:inline-flex;align-items:center;gap:7px;
  font-size:13.5px;color:var(--ink-3);
  transition:color var(--ease);
}
.footer-col ul a i{font-size:10px;color:var(--p1);opacity:.7;}
.footer-col ul a:hover{color:var(--p1);}
.footer-col ul a:hover i{opacity:1;}

.footer-bottom{
  padding-top:24px;
  display:flex;justify-content:space-between;align-items:center;
  gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:var(--ink-4);
}
.footer-bottom-links{display:flex;gap:18px;}
.footer-bottom-links a{color:var(--ink-4);}
.footer-bottom-links a:hover{color:var(--p1);}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:980px){
  .sb-nav-links{display:none;}
  .protocols-layout{grid-template-columns:1fr;gap:48px;}
  .community-inner{flex-direction:column;text-align:center;}
  .community-text p{margin:0 auto;}
  .community-btn{width:100%;max-width:320px;}
}
@media (max-width:820px){
  .hero{padding:70px 20px 180px;}
  .hero-title{font-size:36px;}
  .hero-title-sub{font-size:16px;}
  .features-grid{grid-template-columns:1fr;}
  .downloads-grid{grid-template-columns:repeat(2,1fr);}
  .compare-row{grid-template-columns:1.3fr 1fr 1fr 1fr;}
  .compare-cell{padding:13px 11px;font-size:13px;}
  .compare-cell .col-name{font-size:13.5px;}
  .scenario-block{grid-template-columns:1fr;gap:12px;}
  .scenario-number{font-size:56px;text-align:left;letter-spacing:-2px;}
  .stats-inner{flex-wrap:wrap;}
  .stat-item{min-width:50%;border-right:none;border-bottom:1px solid var(--line);}
  .stat-item:nth-child(odd){border-right:1px solid var(--line);}
  .stat-item:nth-child(3),.stat-item:nth-child(4){border-bottom:none;}
  .stat-num{font-size:42px;}
  .stat-suffix{font-size:28px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:640px){
  .hero-title{font-size:28px;}
  .hero-title-sub{font-size:15px;}
  .hero-buttons{flex-direction:column;align-items:center;}
  .btn{width:100%;max-width:300px;}
  .platform-tab{min-width:64px;padding:10px 12px;font-size:11px;}
  .platform-tab i{font-size:18px;}
  .overview-grid{flex-direction:column;}
  .overview-card{padding:40px 24px;}
  .downloads-grid{grid-template-columns:1fr;}
  .compare-table{overflow-x:auto;}
  .compare-row{min-width:560px;}
  .section-head h2{font-size:24px;}
  .protocols-left h2{font-size:26px;}
  .qs-step{grid-template-columns:60px 1fr;gap:20px;}
  .qs-num{width:44px;height:44px;font-size:13px;}
  .qs-step-right h3{font-size:17px;}
  .faq-question{font-size:14.5px;padding:18px 20px;}
  .faq-answer p{padding:0 20px 20px;}
  .community-text h2{font-size:24px;}
  .scenario-content h3{font-size:18px;}
  .stat-item{min-width:100%;border-right:none !important;border-bottom:1px solid var(--line);}
  .stat-item:last-child{border-bottom:none;}
  .site-footer{padding-top:48px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px;}
  .footer-bottom{flex-direction:column;text-align:center;}
  .footer-bottom-links{justify-content:center;flex-wrap:wrap;}
}