/* ============================================================
   CloudNest · 云服务器租用官网  —  Global Styles
   设计语言：深蓝 + 蓝紫渐变（科技 / 可信 / 专业）
   ============================================================ */

:root {
  --blue-900: #071b39;
  --blue-800: #0b2a55;
  --blue-700: #123d7a;
  --indigo:   #4f5bff;
  --cyan:     #22d3ee;
  --accent:   #6366f1;
  --ink:      #0f172a;
  --muted:    #64748b;
  --line:     #e2e8f0;
  --bg-soft:  #f6f9fe;
  --white:    #ffffff;
  --shadow:   0 10px 40px rgba(15, 23, 42, .08);
  --shadow-lg:0 24px 60px rgba(15, 23, 42, .16);
  --radius:   16px;
  --grad:     linear-gradient(120deg, #4f5bff 0%, #22d3ee 100%);
  --grad-2:   linear-gradient(135deg, #0b2a55 0%, #1e3a8a 50%, #4f5bff 100%);
  --ease:     cubic-bezier(.2, .7, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "WenQuanYi Micro Hei", "PingFang SC", "Microsoft YaHei",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  line-height: 1.7;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------------- 通用标题 ---------------- */
.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--indigo);
  background: rgba(79, 91, 255, .1);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.section-title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-lead {
  font-size: 17px;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto;
}
.center { text-align: center; }
.section-head { text-align: center; margin-bottom: 60px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  padding: 13px 28px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .25s var(--ease), background .2s;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 22px rgba(79,91,255,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(79,91,255,.45); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.3); }
.btn-ghost:hover { background: rgba(255,255,255,.22); }
.btn-outline { background: transparent; color: var(--indigo); border: 1.5px solid var(--indigo); }
.btn-outline:hover { background: var(--indigo); color: #fff; }
.btn-white { background: #fff; color: var(--blue-900); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

/* ==================== 顶部导航 ==================== */
.nav {
  position: fixed; inset: 0 0 auto 0;
  z-index: 100;
  height: 72px;
  display: flex; align-items: center;
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.nav.scrolled { background: rgba(7,27,57,.85); backdrop-filter: blur(12px); box-shadow: 0 4px 24px rgba(0,0,0,.12); }
.nav .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 21px; color: #fff; }
.logo .mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--grad);
  display: grid; place-items: center;
  box-shadow: 0 6px 16px rgba(79,91,255,.4);
}
.logo .mark svg { width: 20px; height: 20px; }
.nav-links { display: flex; gap: 34px; align-items: center; }
.nav-links a { color: rgba(255,255,255,.82); font-size: 15px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: #fff; }
.nav-cta { display: flex; gap: 12px; align-items: center; }
.burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.burger span { width: 24px; height: 2px; background: #fff; border-radius: 2px; }

/* ==================== HERO ==================== */
.hero {
  position: relative;
  min-height: 720px;
  display: flex; align-items: center;
  background: var(--grad-2);
  overflow: hidden;
  padding-top: 72px;
  color: #fff;
}
/* 网格 + 光晕背景 */
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(circle at 70% 40%, #000 30%, transparent 78%);
}
.glow { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .5; }
.glow.g1 { width: 460px; height: 460px; background: var(--indigo); top: -120px; right: -60px; }
.glow.g2 { width: 380px; height: 380px; background: var(--cyan); bottom: -120px; left: 10%; opacity: .3; }
.hero .container { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero-copy h1 { font-size: 52px; font-weight: 800; line-height: 1.15; letter-spacing: -.03em; margin-bottom: 22px; }
.hero-copy h1 .hl { background: linear-gradient(120deg, #8b9bff, #67e8f9); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy p { font-size: 18px; color: rgba(255,255,255,.82); max-width: 520px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-trust { display: flex; gap: 30px; flex-wrap: wrap; }
.hero-trust .item { display: flex; align-items: center; gap: 9px; font-size: 14px; color: rgba(255,255,255,.8); }
.hero-trust .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 4px rgba(34,211,238,.2); }

/* hero 可视化：服务器机架 */
.server-card {
  position: relative; background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.16); border-radius: 22px;
  padding: 30px; backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
}
.server-rack { display: flex; flex-direction: column; gap: 12px; }
.rack-unit {
  display: flex; align-items: center; gap: 14px;
  background: rgba(7,27,57,.55); border: 1px solid rgba(255,255,255,.1);
  border-radius: 12px; padding: 14px 18px;
}
.rack-led { width: 10px; height: 10px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); flex: none; }
.rack-unit:nth-child(2) .rack-led { background: #34d399; box-shadow: 0 0 10px #34d399; }
.rack-unit:nth-child(4) .rack-led { background: #fbbf24; box-shadow: 0 0 10px #fbbf24; }
.rack-label { font-size: 14px; font-weight: 600; color: #fff; }
.rack-sub { font-size: 12px; color: rgba(255,255,255,.6); }
.rack-bar { margin-left: auto; width: 90px; height: 6px; border-radius: 3px; background: rgba(255,255,255,.14); overflow: hidden; }
.rack-bar i { display: block; height: 100%; border-radius: 3px; background: var(--grad); }
.float-stat {
  position: absolute; background: #fff; color: var(--ink);
  border-radius: 14px; padding: 14px 18px; box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 12px;
}
.float-stat .num { font-size: 24px; font-weight: 800; color: var(--indigo); line-height: 1; }
.float-stat .txt { font-size: 12px; color: var(--muted); line-height: 1.3; }
.fs-up   { top: -20px; left: -26px; }
.fs-right{ bottom: 40px; right: -24px; }

/* ==================== 合作伙伴 / logo 条 ==================== */
.logobar { padding: 40px 0; background: var(--bg-soft); border-bottom: 1px solid var(--line); }
.logobar .container { display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.logobar .label { font-size: 13px; color: var(--muted); font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.logos { display: flex; gap: 44px; flex-wrap: wrap; align-items: center; }
.logos .lo { font-size: 19px; font-weight: 700; color: #94a3b8; letter-spacing: .04em; transition: color .2s; }
.logos .lo:hover { color: var(--ink); }

/* ==================== 服务产品 ==================== */
.products { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px 30px; transition: transform .25s var(--ease), box-shadow .25s, border-color .25s;
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.pc-icon {
  width: 58px; height: 58px; border-radius: 14px; background: rgba(79,91,255,.1);
  display: grid; place-items: center; margin-bottom: 22px; color: var(--indigo);
}
.product-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.product-card p { color: var(--muted); font-size: 14.5px; margin-bottom: 18px; min-height: 66px; }
.pc-list li { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink); padding: 5px 0; }
.pc-list svg { width: 16px; height: 16px; color: var(--cyan); flex: none; }

/* ==================== 数据统计 ==================== */
.stats { background: var(--grad-2); color: #fff; }
.stats .section { padding: 70px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center; }
.stat .num { font-size: 46px; font-weight: 800; line-height: 1; background: linear-gradient(120deg,#a5b4fc,#67e8f9); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .txt { font-size: 15px; color: rgba(255,255,255,.8); margin-top: 10px; }

/* ==================== 特性 / 为什么选择 ==================== */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature {
  padding: 30px; border-radius: var(--radius); background: #fff;
  border: 1px solid var(--line); transition: transform .25s var(--ease), box-shadow .25s;
}
.feature:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.feat-icon { width: 52px; height: 52px; border-radius: 13px; background: var(--grad); display: grid; place-items: center; color: #fff; margin-bottom: 18px; }
.feature h4 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--muted); }

/* ==================== 定价 ==================== */
.billing-toggle { display: inline-flex; background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 5px; margin-bottom: 48px; }
.billing-toggle button { border: none; background: transparent; padding: 9px 22px; font-size: 14px; font-weight: 600; color: var(--muted); border-radius: 999px; cursor: pointer; transition: .2s; }
.billing-toggle button.active { background: var(--grad); color: #fff; box-shadow: 0 4px 14px rgba(79,91,255,.3); }
.save-badge { font-size: 12px; background: rgba(52,211,153,.15); color: #059669; padding: 2px 8px; border-radius: 6px; margin-left: 6px; font-weight: 700; }
.pricing { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; align-items: stretch; }
.price-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 26px; display: flex; flex-direction: column;
  transition: transform .25s var(--ease), box-shadow .25s; position: relative;
}
.price-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.price-card.featured { border: 2px solid transparent; background-clip: padding-box; box-shadow: var(--shadow); }
.price-card.featured::before {
  content: ""; position: absolute; inset: 0; border-radius: var(--radius);
  padding: 2px; background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none;
}
.ribbon { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--grad); color: #fff; font-size: 12px; font-weight: 700; padding: 5px 16px; border-radius: 999px; white-space: nowrap; box-shadow: 0 6px 16px rgba(79,91,255,.35); }
.pc-name { font-size: 16px; font-weight: 700; color: var(--muted); margin-bottom: 6px; }
.pc-price { display: flex; align-items: baseline; gap: 4px; margin-bottom: 4px; }
.pc-price .cur { font-size: 20px; font-weight: 700; color: var(--ink); }
.pc-price .amt { font-size: 44px; font-weight: 800; letter-spacing: -.03em; color: var(--ink); }
.pc-price .per { font-size: 14px; color: var(--muted); }
.pc-billing-note { font-size: 12px; color: var(--muted); margin-bottom: 22px; min-height: 18px; }
.pc-specs { border-top: 1px solid var(--line); padding-top: 20px; margin-bottom: 24px; flex: 1; }
.pc-specs li { display: flex; align-items: center; gap: 10px; font-size: 14px; padding: 6px 0; color: var(--ink); }
.pc-specs svg { width: 17px; height: 17px; color: var(--indigo); flex: none; }
.pc-specs .tag { background: rgba(79,91,255,.08); color: var(--indigo); font-size: 12px; font-weight: 600; padding: 1px 8px; border-radius: 6px; margin-left: auto; }
.pc-scenario { font-size: 13px; color: var(--muted); background: var(--bg-soft); border-radius: 10px; padding: 10px 12px; margin-bottom: 22px; }
.pc-btn { width: 100%; justify-content: center; }

/* ==================== 数据中心 ==================== */
.dc-section { background: var(--blue-900); color: #fff; }
.dc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.dc-map { position: relative; }
.dc-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.dc-item { background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.12); border-radius: 14px; padding: 20px; transition: background .2s; }
.dc-item:hover { background: rgba(79,91,255,.25); }
.dc-item .region { font-size: 13px; color: var(--cyan); font-weight: 600; }
.dc-item .city { font-size: 19px; font-weight: 700; margin: 4px 0 8px; }
.dc-item .meta { font-size: 12.5px; color: rgba(255,255,255,.7); display: flex; flex-direction: column; gap: 3px; }

/* ==================== 步骤 ==================== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; counter-reset: step; }
.step { position: relative; padding: 28px 22px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.step .n { width: 40px; height: 40px; border-radius: 50%; background: var(--grad); color: #fff; font-weight: 800; display: grid; place-items: center; margin-bottom: 16px; font-size: 17px; }
.step h5 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 13.5px; color: var(--muted); }

/* ==================== 评价 ==================== */
.reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; transition: transform .25s, box-shadow .25s; }
.review:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.review .stars { color: #fbbf24; font-size: 16px; margin-bottom: 14px; letter-spacing: 2px; }
.review p { font-size: 14.5px; color: var(--ink); margin-bottom: 20px; }
.reviewer { display: flex; align-items: center; gap: 12px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 16px; }
.reviewer .name { font-size: 14px; font-weight: 700; }
.reviewer .role { font-size: 12.5px; color: var(--muted); }

/* ==================== FAQ ==================== */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq { background: #fff; border: 1px solid var(--line); border-radius: 14px; margin-bottom: 14px; overflow: hidden; }
.faq summary { list-style: none; cursor: pointer; padding: 22px 26px; font-size: 16px; font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .ico { width: 26px; height: 26px; border-radius: 50%; background: var(--bg-soft); display: grid; place-items: center; font-size: 16px; color: var(--indigo); transition: transform .25s; flex: none; }
.faq[open] summary .ico { transform: rotate(45deg); background: var(--grad); color: #fff; }
.faq .ans { padding: 0 26px 24px; color: var(--muted); font-size: 14.5px; }

/* ==================== CTA ==================== */
.cta-band { background: var(--grad-2); color: #fff; text-align: center; }
.cta-band .section { padding: 84px 0; }
.cta-band h2 { font-size: 36px; font-weight: 800; margin-bottom: 14px; }
.cta-band p { font-size: 17px; color: rgba(255,255,255,.82); max-width: 560px; margin: 0 auto 30px; }

/* ==================== 页脚 ==================== */
footer { background: var(--blue-900); color: rgba(255,255,255,.72); padding: 70px 0 0; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 50px; }
.foot-brand p { font-size: 14px; margin: 18px 0; max-width: 300px; }
.foot-social { display: flex; gap: 12px; }
.foot-social a { width: 38px; height: 38px; border-radius: 10px; background: rgba(255,255,255,.08); display: grid; place-items: center; transition: background .2s; }
.foot-social a:hover { background: var(--indigo); }
.foot-col h6 { font-size: 15px; color: #fff; font-weight: 700; margin-bottom: 18px; }
.foot-col li { margin-bottom: 11px; }
.foot-col a { font-size: 14px; transition: color .2s; }
.foot-col a:hover { color: #fff; }
.foot-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 26px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 14px; font-size: 13px; }
.foot-contact li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 14px; font-size: 14px; }
.foot-contact svg { width: 18px; height: 18px; color: var(--cyan); flex: none; margin-top: 2px; }

/* ==================== 回到顶部 / 在线客服 ==================== */
.float-actions { position: fixed; right: 24px; bottom: 24px; z-index: 90; display: flex; flex-direction: column; gap: 12px; }
.fab { width: 50px; height: 50px; border-radius: 50%; display: grid; place-items: center; cursor: pointer; box-shadow: var(--shadow-lg); border: none; transition: transform .2s; }
.fab:hover { transform: scale(1.08); }
.fab.chat { background: var(--grad); color: #fff; }
.fab.top { background: #fff; color: var(--ink); }

/* ==================== 入场动画 ==================== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ==================== 响应式 ==================== */
@media (max-width: 960px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: 40px; }
  .server-card { max-width: 440px; margin: 0 auto; }
  .products, .features, .reviews { grid-template-columns: 1fr 1fr; }
  .pricing { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 40px 20px; }
  .dc-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { position: fixed; inset: 72px 0 0 0; flex-direction: column; background: var(--blue-900); padding: 40px; gap: 24px; transform: translateX(100%); transition: transform .3s var(--ease); }
  .nav-links.open { transform: none; }
  .burger { display: flex; }
  .nav-cta .btn-outline { display: none; }
  .section { padding: 68px 0; }
  .section-title { font-size: 29px; }
}
@media (max-width: 560px) {
  .products, .features, .reviews, .pricing, .steps, .foot-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-copy h1 { font-size: 34px; }
  .float-stat.fs-up { left: 0; }
  .float-stat.fs-right { right: 0; }
}