/* ============================================================
   CloudHost — Modern dark tech theme (byet-inspired, original)
   Shared stylesheet for the whole site (home + inner pages)
   ============================================================ */
:root{
  --bg:#07070d;
  --bg-2:#0b0f1c;
  --surface:rgba(15,23,42,.6);
  --border:#1c2536;
  --border-2:#26324a;
  --text:#e5eaf3;
  --text-dim:#a8b3c7;
  --text-mute:#6b7690;
  --primary:#38bdf8;
  --primary-2:#6366f1;
  --accent:#22d3ee;
  --violet:#a855f7;
  --pink:#ec4899;
  --green:#22c55e;
  --yellow:#facc15;
  --font-sans:'Inter','Segoe UI',system-ui,sans-serif;
  --font-display:'Space Grotesk','Inter',sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --radius:16px;
  --maxw:1250px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.text-grad{background:linear-gradient(100deg,#38bdf8,#22d3ee 45%,#a855f7);-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--text-dim);font-size:13px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;margin-bottom:16px}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}

/* ---------- Nav ---------- */
.site-nav{position:sticky;top:0;z-index:100;background:rgba(7,7,13,.72);backdrop-filter:blur(16px);border-bottom:1px solid transparent;transition:.3s}
.site-nav.scrolled{border-color:var(--border);background:rgba(7,7,13,.9)}
.nav-shell{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:11px;color:#fff}
.brand img.brand-logo,.brand .brand-logo{height:48px;width:auto;mix-blend-mode:screen}
.nav-links{display:flex;align-items:center;gap:30px;list-style:none}
.nav-links a{color:var(--text-dim);font-size:14px;font-weight:500;transition:.2s}
.nav-links a:hover,.nav-links a.on{color:#fff}
.nav-cta{background:linear-gradient(135deg,#38bdf8,#6366f1);color:#fff!important;padding:9px 20px;border-radius:10px;font-weight:600;box-shadow:0 6px 20px rgba(56,189,248,.3);transition:.25s}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 10px 28px rgba(56,189,248,.45)}
.nav-toggle{display:none;background:none;border:none;color:#fff;cursor:pointer}

/* ---------- Dropdown (About ▾) ---------- */
.nav-links .has-dropdown{position:relative}
.dd-toggle{display:inline-flex;align-items:center;gap:5px;cursor:pointer}
.caret{font-size:9px;transition:transform .2s;opacity:.7}
.has-dropdown:hover .caret,.has-dropdown.open .caret{transform:rotate(180deg)}
.dropdown{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(10px);background:#0b0f1c;border:1px solid var(--border);border-radius:12px;padding:8px;min-width:170px;list-style:none;opacity:0;visibility:hidden;transition:.22s;box-shadow:0 14px 44px rgba(0,0,0,.55);z-index:50}
.has-dropdown:hover .dropdown,.has-dropdown:focus-within .dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dropdown li{margin:0}
.dropdown a{display:block;padding:9px 16px;border-radius:8px;font-size:14px;color:var(--text-dim);white-space:nowrap}
.dropdown a:hover,.dropdown a.on{color:#fff;background:rgba(56,189,248,.1)}

/* ---------- Mobile Nav ---------- */
@media(max-width: 900px){
  .nav-links {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #0b0f1c;
    flex-direction: column;
    gap: 0;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: none;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-links a:last-child{border-bottom:none}
  .nav-toggle{display:block}
  .nav-links .has-dropdown{position:static}
  .dropdown{
    position:static;left:auto;top:auto;transform:none;opacity:1;visibility:visible;
    display:none;box-shadow:none;padding:0 0 0 18px;min-width:0;border:none;
  }
  .has-dropdown.open .dropdown{display:block}
  .has-dropdown:hover .dropdown{opacity:1;visibility:visible;display:block}
  .dropdown a{padding:12px 0;border-bottom:1px solid var(--border)}
  /* 修复 Sign Up 按钮在移动端撑爆的问题 */
  .nav-links .nav-cta {
    display: block;
    text-align: center;
    margin: 16px 0 8px 0;
    width: 100%;
  }
}

/* ---------- Inner page hero ---------- */
.page-hero{position:relative;overflow:hidden;padding:80px 0 64px;border-bottom:1px solid var(--border)}
.page-hero::before{content:'';position:absolute;inset:0;background:
  radial-gradient(800px 420px at 12% -10%,rgba(56,189,248,.18),transparent 60%),
  radial-gradient(600px 360px at 90% 20%,rgba(99,102,241,.16),transparent 55%)}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-family:var(--font-display);font-size:clamp(30px,4vw,46px);font-weight:700;letter-spacing:-.01em;color:#fff;margin-bottom:14px;line-height:1.15}
.page-hero p{color:var(--text-dim);font-size:17px;max-width:640px}
.crumbs{display:flex;align-items:center;gap:9px;color:var(--text-mute);font-size:13px;margin-bottom:18px}
.crumbs a{color:var(--text-mute);transition:.2s}
.crumbs a:hover{color:#fff}

/* ---------- Sections ---------- */
.section{padding:76px 0}
.section-sm{padding:48px 0}
.section-head{max-width:640px;margin-bottom:48px}
.section-head h2{font-family:var(--font-display);font-size:clamp(26px,3vw,36px);font-weight:700;letter-spacing:-.01em;color:#fff;margin-bottom:12px}
.section-head p{color:var(--text-dim);font-size:16px}
.center{text-align:center;margin-left:auto;margin-right:auto}
.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:11px;font-size:15px;font-weight:600;transition:.25s;cursor:pointer;border:none}
.btn-primary{background:linear-gradient(135deg,#38bdf8,#6366f1);color:#fff;box-shadow:0 8px 26px rgba(56,189,248,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 36px rgba(56,189,248,.48)}
.btn-ghost{background:rgba(15,23,42,.5);color:var(--text);border:1px solid var(--border-2)}
.btn-ghost:hover{background:#17213a;border-color:#38bdf8}
.btn-large{padding:15px 30px;font-size:16px}

/* ---------- Cards / glass ---------- */
.glass{position:relative;background:var(--surface);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius);padding:28px;overflow:hidden;transition:.3s;--mx:50%;--my:50%}
.glass::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(320px at var(--mx) var(--my),rgba(56,189,248,.10),transparent 60%);opacity:0;transition:opacity .3s;pointer-events:none}
.glass:hover{transform:translateY(-5px);border-color:var(--border-2);box-shadow:0 22px 55px rgba(0,0,0,.5)}
.glass:hover::after{opacity:1}
.glass h3{color:#fff;font-size:18px;font-weight:600;margin-bottom:10px}
.glass p{color:var(--text-dim);font-size:14px;line-height:1.65}
.glass .feature-link{display:inline-block;margin-top:14px;color:#38bdf8;font-size:14px;font-weight:600}
.feature-icon{width:52px;height:52px;border-radius:13px;display:grid;place-items:center;font-size:24px;background:linear-gradient(135deg,rgba(56,189,248,.18),rgba(99,102,241,.18));border:1px solid rgba(56,189,248,.3);margin-bottom:18px}
.row-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}

/* ---------- Pricing ---------- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.price-card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:30px;display:flex;flex-direction:column;transition:.3s}
.price-card:hover{transform:translateY(-5px);box-shadow:0 22px 55px rgba(0,0,0,.5)}
.price-card.featured{border:1px solid rgba(56,189,248,.5);box-shadow:0 0 0 1px rgba(56,189,248,.25),0 24px 60px rgba(56,189,248,.1)}
.price-tag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,#38bdf8,#6366f1);color:#fff;font-size:12px;font-weight:700;padding:6px 16px;border-radius:999px}
.price-card h3{color:#fff;font-family:var(--font-display);font-size:20px;margin-bottom:6px}
.price-card .p-sub{color:var(--text-mute);font-size:14px}
.amt{font-family:var(--font-display);font-size:44px;font-weight:700;color:#fff;margin:18px 0 4px}
.amt .per{font-size:14px;color:var(--text-mute);font-weight:400}
.price-card ul{list-style:none;padding:0;margin:20px 0 24px;color:var(--text-dim);font-size:14px;flex:1}
.price-card li{padding:8px 0;border-bottom:1px solid var(--border)}
.price-card li::before{content:'✓ ';color:#22c55e;font-weight:700}
.price-card .btn{justify-content:center}
.price-card .btn-ghost{width:100%}

/* ---------- Feature check list ---------- */
.ck-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0;color:var(--text-dim);font-size:15px}
.ck-list li::before{content:'✓ ';color:#22c55e;font-weight:700}
.feature-matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.matrix-card{background:var(--bg-2);border:1px solid var(--border);border-radius:14px;padding:26px}
.matrix-card h4{color:#fff;font-family:var(--font-display);font-size:17px;margin-bottom:14px;display:flex;align-items:center;gap:9px}
.matrix-card ul{list-style:none;color:var(--text-dim);font-size:14px}
.matrix-card li{padding:7px 0;border-bottom:1px dashed var(--border)}
.matrix-card li::before{content:'✓ ';color:#22c55e;font-weight:700}

/* ---------- Table ---------- */
.table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden}
.table th,.table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--border);font-size:14px}
.table th{background:var(--bg-2);font-weight:600;color:#fff}
.table td{color:var(--text-dim)}
.table tr:last-child td{border-bottom:none}
.table .yes{color:var(--green);font-weight:600}
.table .no{color:var(--text-mute)}
.table tr:hover td{background:rgba(15,23,42,.4)}

/* ---------- Prose / docs ---------- */
.prose{max-width:820px;margin:0 auto;color:var(--text-dim)}
.prose h2{color:#fff;margin:30px 0 14px;font-size:24px;font-family:var(--font-display)}
.prose h3{color:#fff;margin:24px 0 10px;font-size:19px}
.prose p{margin-bottom:14px;line-height:1.8}
.prose ul,.prose ol{margin-left:22px;margin-bottom:14px}
.prose li{margin:6px 0}
.prose code{background:var(--bg-2);border:1px solid var(--border);padding:2px 7px;border-radius:6px;font-family:var(--font-mono);font-size:.92em;color:#22d3ee}
.prose a{color:#38bdf8}

/* ---------- Accordion (FAQ) ---------- */
.accordion{max-width:820px;margin:0 auto}
.acc-item{border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden;background:var(--surface)}
.acc-item.active{border-color:var(--border-2)}
.acc-head{width:100%;background:none;border:none;padding:18px 22px;font-size:16px;font-weight:600;color:#fff;cursor:pointer;display:flex;justify-content:space-between;align-items:center;text-align:left;font-family:var(--font-sans)}
.acc-head .arr{transition:.3s;color:var(--primary)}
.acc-item.active .arr{transform:rotate(180deg)}
.acc-body{display:none;padding:0 22px 18px;color:var(--text-dim);font-size:15px;line-height:1.8}
.acc-item.active .acc-body{display:block}

/* ---------- CTA band ---------- */
.cta{position:relative;overflow:hidden;background:linear-gradient(120deg,#0c4a6e,#1e40af 45%,#4338ca);border-radius:24px;padding:60px 44px;text-align:center}
.cta::before{content:'';position:absolute;inset:0;background:radial-gradient(500px 260px at 20% 120%,rgba(56,189,248,.35),transparent 60%)}
.cta .container{position:relative;z-index:1}
.cta h2{font-family:var(--font-display);font-size:clamp(26px,3.4vw,38px);font-weight:700;color:#fff;margin:6px 0 14px}
.cta p{color:#dbeafe;font-size:16px;margin-bottom:26px;opacity:.92}
.cta .btn-ghost{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.3);color:#fff}

/* ---------- Footer ---------- */
.site-footer{background:#05060b;border-top:1px solid var(--border);padding:60px 0 30px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;margin-bottom:40px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:10px}
.site-footer li a{color:var(--text-dim);font-size:14px;transition:.2s}
.site-footer li a:hover{color:#38bdf8}
.site-footer .brand{margin-bottom:18px}
.site-footer p{color:var(--text-mute);font-size:14px;line-height:1.7;max-width:360px}
.badge-row{display:flex;gap:10px;margin-top:20px}
.badge{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;color:var(--text-dim);padding:6px 12px;border:1px solid var(--border);border-radius:999px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--border);padding-top:20px;color:var(--text-mute);font-size:13px;flex-wrap:wrap;gap:14px}
.social-row{display:flex;gap:10px}
.social-row a{width:34px;height:34px;border-radius:9px;border:1px solid var(--border);display:grid;place-items:center;color:var(--text-dim);transition:.2s}
.social-row a:hover{color:#fff;border-color:#38bdf8}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .row-3,.price-grid,.feature-matrix,.stats-row{grid-template-columns:1fr 1fr}
  .row-2{grid-template-columns:1fr;gap:40px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .row-3,.price-grid,.feature-matrix,.stats-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{justify-content:center;text-align:center}
}

/* ---------- Tech grid (stack / OS tiles) ---------- */
.tech-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px}
.tech-tile{background:var(--bg-2);border:1px solid var(--border);border-radius:13px;padding:22px;text-align:center;transition:.25s}
.tech-tile:hover{border-color:var(--border-2);transform:translateY(-3px);background:#0f1626}
.tech-tile .ico{font-size:26px;margin-bottom:8px}
.tech-tile .name{color:var(--text-dim);font-size:14px;font-weight:600}
@media(max-width:960px){.tech-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:600px){.tech-grid{grid-template-columns:1fr}}