/* =========================================
   芮昕科技官网 · 共享样式 (main.css)
   基于方案 C · 清新青绿 (#0d9488 + #22d3ee)
   ========================================= */

:root {
  --primary: #0d9488;
  --secondary: #22d3ee;
  --accent: #a855f7;
  --warm: #f59e0b;
  --danger: #ef4444;
  --success: #22c55e;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #9ca3af;
  --border: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-mint: #ecfeff;
  --font: "Inter","PingFang SC","Microsoft YaHei",sans-serif;
  --mono: "JetBrains Mono","Menlo",monospace;
  --radius: 14px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 8px rgba(15,23,42,.06);
  --shadow-md: 0 8px 24px rgba(15,23,42,.1);
  --shadow-lg: 0 16px 48px rgba(15,23,42,.15);
  --shadow-brand: 0 12px 28px rgba(13,148,136,.25);
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;}
a{text-decoration:none;color:inherit;}
ul,ol{list-style:none;}
img{max-width:100%;display:block;}
button{cursor:pointer;font-family:inherit;border:none;background:none;}
input,select,textarea{font-family:inherit;font-size:14px;}
.mono{font-family:var(--mono);}
.wrap{max-width:1280px;margin:0 auto;padding:0 32px;}
.container{max-width:1200px;margin:0 auto;padding:0 24px;}

/* ============ NAV ============ */
.nav{padding:16px 0;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(13,148,136,.06);position:sticky;top:0;z-index:99;}
.nav-inner{display:flex;justify-content:space-between;align-items:center;}
.logo{display:flex;align-items:center;gap:10px;font-size:28px;font-weight:800;letter-spacing:1px;color:var(--text);}
.logo-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#0d9488,#22d3ee);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:15px;overflow:hidden;}
img.logo-mark{background:transparent!important;border-radius:0!important;box-shadow:none!important;display:block!important;}
.nav-menu{display:flex;gap:28px;font-size:14.5px;color:#475569;font-weight:500;}
.nav-menu a{padding:6px 0;position:relative;transition:.2s;}
.nav-menu a:hover{color:var(--primary);}
.nav-menu a.active{color:var(--primary);}
.nav-menu a.active::after{content:"";position:absolute;bottom:-2px;left:0;right:0;height:2px;background:linear-gradient(90deg,#0d9488,#22d3ee);border-radius:1px;}
.nav-cta{padding:10px 22px;border-radius:8px;background:linear-gradient(135deg,#0d9488,#22d3ee);color:#fff;font-weight:600;cursor:pointer;transition:.2s;font-size:14px;}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 8px 18px rgba(13,148,136,.3);}

/* ============ BUTTONS ============ */
.btn-grad{padding:14px 30px;border-radius:10px;background:linear-gradient(135deg,#0d9488,#22d3ee);color:#fff;font-weight:600;cursor:pointer;font-size:15px;transition:.2s;display:inline-flex;align-items:center;gap:8px;position:relative;overflow:hidden;border:none;}
.btn-grad::before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);animation:shine 3s infinite;}
@keyframes shine{to{left:100%;}}
.btn-grad:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(13,148,136,.35);}
.btn-grad::after{content:"→";font-size:18px;}
.btn-grad.no-arrow::after{display:none;}
.btn-line{padding:14px 30px;border-radius:10px;background:#fff;color:#0f172a;border:1.5px solid #e2e8f0;font-weight:600;cursor:pointer;font-size:15px;transition:.2s;display:inline-flex;align-items:center;gap:8px;}
.btn-line:hover{border-color:var(--primary);color:var(--primary);}
.btn-small{padding:8px 16px;border-radius:6px;background:var(--primary);color:#fff;font-weight:600;font-size:13px;display:inline-flex;align-items:center;gap:4px;transition:.2s;}
.btn-small:hover{background:#0f766e;}

/* ============ SECTION 通用 ============ */
.section{padding:96px 0;position:relative;z-index:2;}
.section.alt{background:#f0fdfa;}
.section-head{text-align:center;margin-bottom:64px;}
.section-head .pill{display:inline-block;padding:6px 14px;border-radius:20px;background:var(--bg-mint);color:var(--primary);font-size:13px;font-weight:600;margin-bottom:14px;}
.section-head h2{font-size:38px;font-weight:800;letter-spacing:-0.5px;margin-bottom:14px;}
.section-head p{color:var(--text-muted);font-size:16px;max-width:680px;margin:0 auto;}
.section-head.left{text-align:left;}
.section-head.left p{margin:0;}

/* ============ CARDS ============ */
.card{background:#fff;border-radius:var(--radius);border:1px solid var(--border);padding:32px 28px;transition:.25s;}
.card:hover{transform:translateY(-6px);box-shadow:0 20px 40px rgba(13,148,136,.15);border-color:transparent;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}

/* ============ STATS BAR ============ */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:0;background:#fff;border:1px solid rgba(13,148,136,.15);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;}
.stats-bar::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,#0d9488,#22d3ee,#a855f7);}
.st-item{padding:16px 20px;border-right:1px solid rgba(13,148,136,.08);}
.st-item:last-child{border-right:none;}
.st-item .lbl{font-family:var(--mono);font-size:11px;color:var(--text-light);letter-spacing:1px;margin-bottom:6px;}
.st-item .num{font-size:32px;font-weight:800;color:var(--text);font-family:var(--mono);line-height:1.2;}
.st-item .num .plus{color:var(--primary);}
.st-item .chg{font-size:11px;color:var(--success);margin-top:2px;font-family:var(--mono);}
.st-item .chg::before{content:"▲ ";}

/* ============ FOOTER ============ */
footer{padding:60px 0 28px;border-top:1px solid rgba(13,148,136,.08);font-size:14px;color:var(--text-muted);background:#fff;}
footer .grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px;}
footer .brand-col p{margin-top:14px;color:var(--text-light);font-size:13px;line-height:1.7;}
footer h5{color:var(--text);font-size:15px;font-weight:700;margin-bottom:14px;}
footer h5::before{content:"// ";color:var(--primary);font-family:var(--mono);}
footer li{padding:5px 0;}
footer li::before{content:"› ";color:var(--primary);font-family:var(--mono);}
footer li a:hover{color:var(--primary);}
footer .bot{padding-top:24px;border-top:1px solid rgba(13,148,136,.08);display:flex;justify-content:space-between;font-family:var(--mono);font-size:12px;color:var(--text-light);flex-wrap:wrap;gap:14px;}

/* ============ 右侧快捷栏 ============ */
.side-tool{position:fixed;right:20px;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:10px;z-index:50;}
.st-btn{width:48px;height:48px;border-radius:50%;background:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 6px 20px rgba(15,23,42,.1);color:var(--primary);font-size:18px;border:1px solid rgba(13,148,136,.15);transition:.25s;position:relative;}
.st-btn:hover{background:var(--primary);color:#fff;transform:translateX(-2px);border-color:var(--primary);}
.st-tip{position:absolute;right:60px;top:50%;transform:translateY(-50%);background:#0f172a;color:#fff;font-size:12px;padding:6px 12px;border-radius:6px;white-space:nowrap;opacity:0;pointer-events:none;transition:.25s;}
.st-btn:hover .st-tip{opacity:1;right:64px;}
.st-btn.st-top{background:var(--primary);color:#fff;border-color:var(--primary);display:none;}
.st-btn.st-top.show{display:flex;}
.st-btn.st-top:hover{background:#0f766e;}

/* ============ 滚动渐入 ============ */
.reveal{opacity:0;transform:translateY(40px);transition:all .8s cubic-bezier(.2,.8,.2,1);}
.reveal.in{opacity:1;transform:none;}

/* ============ 标签 / Pills ============ */
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:20px;background:var(--bg-mint);color:var(--primary);font-size:12px;font-weight:600;}
.tag.live::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--success);box-shadow:0 0 6px var(--success);animation:pulse 1.5s infinite;}
@keyframes pulse{50%{opacity:.3;transform:scale(.7);}}

/* ============ Responsive ============ */
@media(max-width:1024px){
  .nav-menu{display:none;}
  footer .grid{grid-template-columns:1fr 1fr;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .stats-bar{grid-template-columns:repeat(2,1fr);}
  .st-item{border-right:none;border-bottom:1px solid rgba(13,148,136,.08);}
  .section-head h2{font-size:32px;}
}
@media(max-width:600px){
  .wrap{padding:0 20px;}
  footer .grid{grid-template-columns:1fr;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
  .stats-bar{grid-template-columns:1fr;}
  .section{padding:64px 0;}
  .section-head h2{font-size:28px;}
  .side-tool{display:none;}
}