/* ===== Design System: 云枢 SaaS ===== */
:root{
  --pri:#2563eb;--pri-h:#1d4ed8;--pri-l:#eff6ff;--pri-bg:#dbeafe;
  --acc:#0d9488;--acc-h:#0f766e;--acc-l:#f0fdfa;
  --t:#0f172a;--t2:#475569;--t3:#94a3b8;
  --bg:#f8fafc;--bg2:#f1f5f9;--w:#fff;
  --bd:#e2e8f0;--bd2:#f1f5f9;
  --sh:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --sh-md:0 4px 6px rgba(0,0,0,.05),0 2px 4px rgba(0,0,0,.04);
  --sh-lg:0 10px 25px rgba(0,0,0,.07),0 4px 10px rgba(0,0,0,.04);
  --r:8px;--r-lg:12px;--mw:1200px;
  --green:#22c55e;--red:#ef4444;--amber:#f59e0b;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--t);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}ul{list-style:none}img{max-width:100%}
button,input,select,textarea{font-family:inherit;font-size:inherit}
.container{max-width:var(--mw);margin:0 auto;padding:0 24px}

/* ---- nav ---- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--bd);height:64px}
.nav.scrolled{box-shadow:var(--sh)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--t)}
.nav-logo i{width:36px;height:36px;background:var(--pri);border-radius:var(--r);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:800;font-style:normal}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{font-size:14px;color:var(--t2);transition:color .15s;font-weight:500}
.nav-links a:hover{color:var(--pri)}
.nav-actions{display:flex;gap:10px;align-items:center}
.nav-toggle{display:none;flex-direction:column;gap:4px;background:none;border:none;padding:4px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--t);border-radius:1px}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 20px;font-size:14px;font-weight:500;border-radius:var(--r);transition:all .15s;cursor:pointer;border:none;white-space:nowrap}
.btn-p{background:var(--pri);color:#fff}.btn-p:hover{background:var(--pri-h)}
.btn-o{background:var(--w);color:var(--t);border:1px solid var(--bd)}.btn-o:hover{border-color:var(--pri);color:var(--pri)}
.btn-a{background:var(--acc);color:#fff}.btn-a:hover{background:var(--acc-h)}
.btn-lg{padding:14px 32px;font-size:16px;border-radius:var(--r-lg)}
.btn-sm{padding:6px 14px;font-size:12px}
.btn-block{width:100%}
.btn:disabled{opacity:.5;pointer-events:none}

/* ---- sections ---- */
.sec{padding:80px 0}
.sec-hd{text-align:center;max-width:640px;margin:0 auto 56px}
.sec-lbl{display:inline-block;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--pri);margin-bottom:12px}
.sec-t{font-size:34px;font-weight:700;line-height:1.2;color:var(--t);margin-bottom:16px}
.sec-d{font-size:16px;color:var(--t2);line-height:1.7}

/* ---- hero ---- */
.hero{padding:140px 0 100px;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;background:var(--pri-bg);color:var(--pri);border-radius:20px;font-size:13px;font-weight:500;margin-bottom:28px}
.hero-badge .dot{width:6px;height:6px;background:var(--pri);border-radius:50%}
.hero h1{font-size:52px;font-weight:800;line-height:1.15;letter-spacing:-.02em;margin-bottom:20px}
.hero h1 span{background:linear-gradient(135deg,var(--pri),var(--acc));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:18px;color:var(--t2);max-width:640px;margin:0 auto 40px;line-height:1.7}
.hero-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;justify-content:center;gap:48px;margin-top:64px;flex-wrap:wrap}
.hero-stat{text-align:center}.hero-stat-n{font-size:36px;font-weight:800;color:var(--t)}.hero-stat-l{font-size:13px;color:var(--t3);margin-top:4px}
.hero-stat-d{width:1px;background:var(--bd);align-self:stretch}

/* ---- features grid ---- */
.fgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.fcard{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);padding:28px 24px;transition:all .2s}
.fcard:hover{transform:translateY(-2px);box-shadow:var(--sh-lg);border-color:transparent}
.fcard-ic{width:44px;height:44px;border-radius:var(--r);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.fcard-nm{font-size:15px;font-weight:600;color:var(--t);margin-bottom:8px}
.fcard-ds{font-size:13px;color:var(--t2);line-height:1.6}
.fcard-tag{display:inline-block;margin-top:12px;padding:3px 10px;border-radius:12px;font-size:11px;font-weight:500}
.tag-ai{background:#eef2ff;color:#4f46e5}.tag-vis{background:#f0fdf4;color:#15803d}.tag-vid{background:#fef3c7;color:#b45309}

/* ---- pricing ---- */
.pgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.pcard{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);padding:32px 28px;position:relative;transition:all .2s}
.pcard:hover{border-color:var(--pri);box-shadow:var(--sh-md)}
.pcard.pop{border-color:var(--pri);box-shadow:var(--sh-lg);border-width:2px}
.pcard.pop::before{content:"推荐";position:absolute;top:-12px;right:24px;background:var(--pri);color:#fff;padding:4px 14px;border-radius:12px;font-size:12px;font-weight:500}
.pnm{font-size:16px;font-weight:700;color:var(--t);margin-bottom:8px}
.pprice{display:flex;align-items:baseline;gap:4px;margin-bottom:16px}
.pprice-n{font-size:40px;font-weight:800;color:var(--t);line-height:1}
.pprice-u{font-size:14px;color:var(--t2)}
.pfeats{display:flex;flex-direction:column;gap:10px;margin-bottom:28px}
.pfeat{font-size:13px;color:var(--t2);display:flex;align-items:center;gap:8px}
.pfeat::before{content:"";width:5px;height:5px;background:var(--acc);border-radius:50%;flex-shrink:0}

/* ---- cta ---- */
.cta{background:linear-gradient(135deg,#1e3a5f,#0f172a);padding:80px 0;text-align:center}
.cta-inner{max-width:600px;margin:0 auto;padding:0 24px}
.cta h2{font-size:34px;font-weight:700;color:#fff;margin-bottom:16px}
.cta p{font-size:16px;color:#94a3b8;margin-bottom:36px;line-height:1.7}
.cta-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}

/* ---- footer ---- */
.footer{background:#0f172a;padding:60px 24px 32px;color:#94a3b8}
.fgrid-ft{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px}
.ft-brand h3{color:#fff;font-size:20px;font-weight:700;margin-bottom:12px}
.ft-brand p{font-size:13px;line-height:1.7}
.ft-col h4{color:#e2e8f0;font-size:13px;font-weight:600;margin-bottom:16px;text-transform:uppercase;letter-spacing:.05em}
.ft-col a{display:block;font-size:13px;color:#64748b;margin-bottom:10px;transition:color .15s}
.ft-col a:hover{color:#e2e8f0}
.ft-bot{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:12px;color:#475569}

/* ---- mobile menu ---- */
.mob-menu{display:none;position:fixed;top:64px;left:0;right:0;bottom:0;background:var(--w);z-index:99;padding:24px;flex-direction:column;gap:4px;overflow-y:auto}
.mob-menu.active{display:flex}
.mob-menu a{display:block;padding:12px 16px;font-size:16px;color:var(--t);border-radius:var(--r)}
.mob-menu a:hover{background:var(--bg2)}
.mob-menu .sep{margin:12px 0;border-top:1px solid var(--bd)}

/* ---- auth pages ---- */
.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:24px}
.auth-card{background:var(--w);border-radius:var(--r-lg);box-shadow:var(--sh-lg);padding:48px 40px;width:100%;max-width:440px}
.auth-card h2{font-size:24px;font-weight:700;color:var(--t);margin-bottom:8px;text-align:center}
.auth-card .sub{font-size:14px;color:var(--t2);text-align:center;margin-bottom:32px}
.auth-tabs{display:flex;gap:0;margin-bottom:28px;border-bottom:1px solid var(--bd)}
.auth-tab{flex:1;text-align:center;padding:10px;font-size:14px;font-weight:500;color:var(--t2);cursor:pointer;border-bottom:2px solid transparent;transition:all .15s;background:none;border-top:none;border-left:none;border-right:none}
.auth-tab.active{color:var(--pri);border-bottom-color:var(--pri)}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:13px;font-weight:500;color:var(--t);margin-bottom:6px}
.form-group input,.form-group select{width:100%;padding:10px 14px;border:1px solid var(--bd);border-radius:var(--r);font-size:14px;transition:border-color .15s;outline:none;background:var(--w)}
.form-group input:focus,.form-group select:focus{border-color:var(--pri);box-shadow:0 0 0 3px var(--pri-l)}
.form-group .hint{font-size:12px;color:var(--t3);margin-top:4px}
.form-row{display:flex;gap:12px}
.form-row .form-group{flex:1}
.sms-row{display:flex;gap:10px}.sms-row input{flex:1}
.sms-btn{padding:10px 16px;font-size:13px;white-space:nowrap}
.form-footer{text-align:center;margin-top:20px;font-size:13px;color:var(--t2)}
.form-footer a{color:var(--pri);font-weight:500}
.form-footer a:hover{text-decoration:underline}
.auth-divider{display:flex;align-items:center;gap:12px;margin:24px 0;color:var(--t3);font-size:12px}
.auth-divider::before,.auth-divider::after{content:"";flex:1;border-top:1px solid var(--bd)}
.social-login{display:flex;justify-content:center;gap:16px}
.social-btn{width:44px;height:44px;border-radius:var(--r);border:1px solid var(--bd);display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;transition:all .15s;background:var(--w)}
.social-btn:hover{background:var(--bg2);border-color:var(--t3)}

/* ---- dashboard ---- */
.dash{min-height:100vh;background:var(--bg)}
.dash-body{padding-top:88px;padding-bottom:48px}
.dash-header{margin-bottom:32px}
.dash-header h2{font-size:24px;font-weight:700;color:var(--t)}
.dash-header .greeting{font-size:14px;color:var(--t2);margin-top:4px}
.dash-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:32px}
.dstat{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);padding:20px}
.dstat-l{font-size:12px;color:var(--t2);margin-bottom:8px;font-weight:500}
.dstat-n{font-size:28px;font-weight:700;color:var(--t)}
.dstat-c{font-size:12px;color:var(--green);margin-top:6px}
.dash-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
.dash-toolbar h3{font-size:18px;font-weight:600;color:var(--t)}
.quick-actions{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:40px}
.qact{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);padding:20px 16px;text-align:center;transition:all .2s;cursor:pointer;display:block}
.qact:hover{transform:translateY(-2px);box-shadow:var(--sh-md);border-color:var(--pri)}
.qact-ic{font-size:28px;margin-bottom:8px}
.qact-nm{font-size:13px;font-weight:600;color:var(--t)}
.recent-list{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);overflow:hidden}
.recent-list table{width:100%;border-collapse:collapse}
.recent-list th{text-align:left;padding:12px 16px;font-size:12px;color:var(--t2);font-weight:500;border-bottom:1px solid var(--bd);background:var(--bg2)}
.recent-list td{padding:12px 16px;font-size:13px;border-bottom:1px solid var(--bd2);color:var(--t)}
.recent-list tr:last-child td{border-bottom:none}

/* ---- feature page ---- */
.fpage{min-height:100vh}
.fpage-body{padding-top:88px;padding-bottom:48px}
.fpage-header{margin-bottom:32px}
.fpage-header h2{font-size:26px;font-weight:700;color:var(--t);display:flex;align-items:center;gap:12px}
.fpage-header p{font-size:14px;color:var(--t2);margin-top:8px}
.fpage-toolbar{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap}
.fpage-toolbar .btn{font-size:13px}
.workspace{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);min-height:400px;padding:24px}
.workspace-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;color:var(--t3);font-size:14px;gap:16px}
.workspace-placeholder .ic{font-size:48px}

/* ---- help ---- */
.help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.help-card{background:var(--w);border:1px solid var(--bd);border-radius:var(--r-lg);padding:24px;transition:all .2s}
.help-card:hover{border-color:var(--pri);box-shadow:var(--sh-md)}
.help-card-ic{font-size:32px;margin-bottom:12px}
.help-card h4{font-size:15px;font-weight:600;color:var(--t);margin-bottom:8px}
.help-card p{font-size:13px;color:var(--t2);line-height:1.6}

/* ---- responsive ---- */
@media(max-width:1199px){.fgrid{grid-template-columns:repeat(3,1fr)}.quick-actions{grid-template-columns:repeat(3,1fr)}.dash-stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:1023px){.pgrid{grid-template-columns:repeat(2,1fr)}.fgrid-ft{grid-template-columns:1fr 1fr}.hero h1{font-size:40px}.fgrid{grid-template-columns:repeat(2,1fr)}.quick-actions{grid-template-columns:repeat(2,1fr)}}
@media(max-width:767px){
  .nav-links,.nav-actions .btn{display:none}.nav-toggle{display:flex}
  .hero{padding:120px 20px 60px}.hero h1{font-size:30px}.hero p{font-size:15px}
  .hero-stats{gap:24px}.hero-stat-n{font-size:28px}
  .fgrid{grid-template-columns:1fr 1fr}.pgrid{grid-template-columns:1fr}
  .sec{padding:48px 0}.sec-t{font-size:26px}
  .fgrid-ft{grid-template-columns:1fr}.cta h2{font-size:26px}
  .dash-stats{grid-template-columns:1fr}.quick-actions{grid-template-columns:repeat(2,1fr)}
  .auth-card{padding:32px 24px}.form-row{flex-direction:column}
  .help-grid{grid-template-columns:1fr}
}
@media(max-width:479px){.fgrid{grid-template-columns:1fr}.hero-actions{flex-direction:column}.hero-actions .btn{width:100%}.quick-actions{grid-template-columns:1fr}}