/* ============================================================
   common.css — 全站共用样式（变量 / 重置 / 背景 / 头 / 脚 / 按钮）
   ============================================================ */

:root{
  --bg:#0a0b10;
  --bg-2:#10121a;
  --surface:rgba(255,255,255,0.04);
  --surface-2:rgba(255,255,255,0.07);
  --border:rgba(255,255,255,0.08);
  --text:#e7e9ef;
  --muted:#8b90a0;
  --accent:#00E6E7;        /* 主色青 */
  --accent-2:#66f2f2;
  --accent-3:#00b8b9;
  --accent-4:#7effd8;
  --neutral:#414141;
  --grad:linear-gradient(135deg,var(--accent) 0%,var(--accent-3) 100%);
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 20px 60px -20px rgba(0,0,0,.6);
  --header-h:76px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.65;}
body{overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ---------- 背景 ---------- */
.bg-orbs{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.bg-orbs::before,.bg-orbs::after{
  content:"";position:absolute;width:700px;height:700px;border-radius:50%;filter:blur(120px);opacity:.35;
}
.bg-orbs::before{background:radial-gradient(circle,var(--accent) 0%,transparent 70%);top:-200px;left:-200px;animation:float1 18s ease-in-out infinite}
.bg-orbs::after{background:radial-gradient(circle,var(--neutral) 0%,transparent 70%);top:20%;right:-250px;animation:float2 22s ease-in-out infinite;opacity:.55}
@keyframes float1{50%{transform:translate(100px,80px) scale(1.1)}}
@keyframes float2{50%{transform:translate(-120px,100px) scale(.9)}}

.grid-bg{position:fixed;inset:-240px 0 0 0;z-index:0;pointer-events:none;opacity:.2;filter:blur(1.2px);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='260' height='260' viewBox='0 0 260 260'><g fill='rgba(255,255,255,0.045)'><rect x='20' y='16' width='70' height='5' rx='2'/><rect x='96' y='16' width='42' height='5' rx='2'/><rect x='40' y='38' width='128' height='5' rx='2'/><rect x='20' y='60' width='24' height='5' rx='2'/><rect x='52' y='60' width='96' height='5' rx='2'/><rect x='60' y='82' width='150' height='5' rx='2'/><rect x='20' y='104' width='58' height='5' rx='2'/><rect x='86' y='104' width='80' height='5' rx='2'/><rect x='40' y='126' width='46' height='5' rx='2'/><rect x='94' y='126' width='118' height='5' rx='2'/><rect x='40' y='148' width='30' height='5' rx='2'/><rect x='78' y='148' width='104' height='5' rx='2'/><rect x='20' y='170' width='170' height='5' rx='2'/><rect x='40' y='192' width='72' height='5' rx='2'/><rect x='120' y='192' width='58' height='5' rx='2'/><rect x='20' y='214' width='108' height='5' rx='2'/><rect x='136' y='214' width='60' height='5' rx='2'/><rect x='40' y='236' width='90' height='5' rx='2'/></g><g fill='rgba(0,230,231,0.14)'><rect x='20' y='60' width='24' height='5' rx='2'/><rect x='40' y='126' width='46' height='5' rx='2'/><rect x='120' y='192' width='58' height='5' rx='2'/></g></svg>");
  background-size:260px 260px;animation:codeflow 90s linear infinite;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 20%,#000 0%,rgba(0,0,0,.6) 55%,transparent 90%);
          mask-image:radial-gradient(ellipse 80% 60% at 50% 20%,#000 0%,rgba(0,0,0,.6) 55%,transparent 90%);
}
@keyframes codeflow{from{background-position:0 0}to{background-position:0 260px}}

/* ---------- 容器 ---------- */
.wrap{max-width:1200px;margin:0 auto;padding:0 28px;position:relative;z-index:1}

/* ---------- Header ---------- */
header.site-header{position:sticky;top:0;z-index:50;
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  background:rgba(10,11,16,.72);border-bottom:1px solid var(--border)}
header.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:24px}
.brand{display:flex;align-items:center;gap:12px;min-width:0;flex-shrink:0}
.brand img{width:40px;height:40px;display:block}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-name{font-weight:800;font-size:17px;letter-spacing:.3px;color:var(--text)}
.brand-sub{font-size:11px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-top:2px}

nav.primary{display:flex;gap:4px;align-items:center;font-size:14.5px;flex:1;justify-content:center}
nav.primary a.nav-link{position:relative;padding:8px 14px;border-radius:8px;color:var(--muted);transition:.2s}
nav.primary a.nav-link:hover{color:var(--text);background:var(--surface)}
nav.primary a.nav-link.active{color:var(--accent);background:rgba(0,230,231,.08)}
nav.primary a.nav-link.active::after{content:"";position:absolute;left:50%;bottom:-2px;transform:translateX(-50%);
  width:22px;height:2px;border-radius:2px;background:var(--accent);box-shadow:0 0 10px var(--accent)}

.header-actions{display:flex;gap:10px;align-items:center;flex-shrink:0}

/* 移动端汉堡按钮 */
.nav-toggle{display:none;width:40px;height:40px;border-radius:10px;background:var(--surface);
  border:1px solid var(--border);cursor:pointer;align-items:center;justify-content:center;color:var(--text)}
.nav-toggle svg{width:20px;height:20px}

/* 移动端滑出面板 */
.mobile-menu{position:fixed;inset:var(--header-h) 0 0 0;z-index:45;
  background:rgba(10,11,16,.96);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  padding:24px 20px 40px;transform:translateY(-12px);opacity:0;visibility:hidden;transition:.3s;
  overflow-y:auto;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:6px}
.mobile-menu.open{transform:translateY(0);opacity:1;visibility:visible}
.mobile-menu a.nav-link{display:flex;align-items:center;padding:14px 16px;border-radius:12px;
  color:var(--text);font-size:16px;font-weight:500;border:1px solid transparent}
.mobile-menu a.nav-link.active{background:rgba(0,230,231,.1);border-color:rgba(0,230,231,.3);color:var(--accent)}
.mobile-menu a.nav-link:active{background:var(--surface)}
.mobile-menu .divider{height:1px;background:var(--border);margin:12px 0}
.mobile-menu .m-actions{display:flex;flex-direction:column;gap:10px;margin-top:8px}
.mobile-menu .m-actions .btn{justify-content:center;padding:14px 18px;font-size:15px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:10px;
  font-weight:600;font-size:14px;transition:transform .2s,box-shadow .2s,background .2s,border-color .2s;
  cursor:pointer;border:1px solid transparent;white-space:nowrap}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--accent);color:#111;border-color:var(--accent);box-shadow:0 10px 28px -10px rgba(0,230,231,.6)}
.btn-primary:hover{background:#33ecec;border-color:#33ecec;transform:translateY(-2px);box-shadow:0 14px 32px -10px rgba(0,230,231,.85)}
.btn-grad{background:var(--grad);color:#111;border-color:transparent;box-shadow:0 10px 30px -10px rgba(0,230,231,.65)}
.btn-grad:hover{transform:translateY(-2px);box-shadow:0 14px 36px -10px rgba(0,230,231,.9)}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--border)}
.btn-ghost:hover{background:var(--surface-2);border-color:rgba(255,255,255,.18)}
.btn-soft{background:transparent;color:var(--muted);border-color:var(--border)}
.btn-soft:hover{color:var(--text);border-color:rgba(0,230,231,.5);background:rgba(0,230,231,.06)}

/* ---------- Footer ---------- */
footer.site-footer{border-top:1px solid var(--border);padding:64px 0 28px;margin-top:60px;
  color:var(--muted);font-size:14px}
footer.site-footer a:hover{color:var(--accent)}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1.3fr;gap:48px;padding-bottom:40px;
  border-bottom:1px solid var(--border)}
.foot-col{display:flex;flex-direction:column}
.foot-col h4{margin:0 0 18px;color:var(--text);font-size:14px;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase}
.foot-col a{color:var(--muted);padding:6px 0;font-size:14px;transition:.2s;line-height:1.5;word-break:break-all}
.foot-brand .foot-logo{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}
.foot-brand .foot-logo img{width:32px;height:32px;display:block}
.foot-brand .foot-logo span{color:var(--text);font-weight:800;font-size:17px;letter-spacing:.3px}
.foot-brand .foot-desc{margin:0 0 10px;font-size:13.5px;line-height:1.75;color:var(--muted);max-width:420px}
.foot-brand .foot-desc b{color:var(--accent);font-weight:700}
.foot-brand .foot-desc.en{font-size:12.5px;color:rgba(139,144,160,.75);line-height:1.6}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;
  padding-top:24px;flex-wrap:wrap}
.foot-bottom p{margin:0;font-size:12.5px;color:var(--muted)}
.social{display:flex;gap:10px}
.social a{width:36px;height:36px;display:grid;place-items:center;border-radius:10px;
  background:var(--surface);border:1px solid var(--border);transition:.2s;color:var(--muted)}
.social a:hover{background:var(--surface-2);color:var(--accent)}
@media (max-width:860px){
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px}
  .foot-brand{grid-column:1/-1}
}
@media (max-width:520px){
  .foot-grid{grid-template-columns:1fr;gap:28px;padding-bottom:28px}
  .foot-bottom{flex-direction:column;align-items:flex-start;text-align:left}
  footer.site-footer{padding:48px 0 24px}
}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 区块公用 ---------- */
section.block{padding:100px 0;position:relative}
.section-head{text-align:center;max-width:720px;margin:0 auto 64px}
.section-label{display:inline-block;font-size:13px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--accent);margin-bottom:14px;font-weight:600}
.section-head h2{font-size:clamp(28px,4vw,48px);margin:0 0 16px;font-weight:800;letter-spacing:-.02em}
.section-head p{color:var(--muted);font-size:17px;margin:0}

/* ---------- CTA 通用卡片（全站共用） ---------- */
.cta{display:block;width:100%;box-sizing:border-box;
  margin:60px auto 0;padding:60px 40px;border-radius:24px;
  background:linear-gradient(135deg,rgba(0,230,231,.12),rgba(0,184,185,.12));
  border:1px solid var(--border);text-align:center;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(circle at 50% 0%,rgba(0,230,231,.2),transparent 60%)}
.cta>*{position:relative;z-index:1}
.cta h2{font-size:clamp(24px,3.5vw,36px);margin:0 auto 14px;font-weight:800;max-width:100%}
.cta p{color:var(--muted);margin:0 auto 28px;max-width:680px}
.cta .btns{display:flex;gap:12px;justify-content:center;align-items:center;flex-wrap:wrap;margin:0 auto}
@media (max-width:780px){
  .cta{padding:40px 22px;margin-top:40px}
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:980px){
  nav.primary{display:none}
  .brand-sub{display:none}
  .nav-toggle{display:inline-flex}
}
@media (max-width:640px){
  :root{--header-h:62px}
  header.site-header .wrap{gap:12px;padding:0 18px}
  .brand img{width:34px;height:34px}
  .brand-name{font-size:15px}
  .header-actions .btn-soft{display:none}
  .header-actions .btn{padding:8px 14px;font-size:13px}
  .header-actions .btn span.label{display:none}
  .wrap{padding:0 20px}
  section.block{padding:64px 0}
  .section-head{margin-bottom:40px}
  footer.site-footer .wrap{flex-direction:column;align-items:flex-start;text-align:left}
}
@media (max-width:420px){
  .header-actions .btn-primary{padding:8px 12px}
}