/* ============================================================
   云优数据 YUNYOU DATA - 美国云服务器官网 全站样式
   深色科技风 / 响应式 / 无第三方依赖（利于百度抓取与加载速度）
   ============================================================ */

:root {
  --navy-950: #070d1a;
  --navy-900: #0a1122;
  --navy-830: #0d1730;
  --navy-800: #111d3c;
  --blue-500: #2f7bff;
  --blue-400: #4c9aff;
  --cyan-400: #38bdf8;
  --cyan-300: #7dd8fc;
  --text-hi: #eaf1ff;
  --text-mid: #b7c4dd;
  --text-low: #8291ad;
  --line: rgba(122, 150, 200, 0.16);
  --line-strong: rgba(76, 154, 255, 0.45);
  --radius: 14px;
  --maxw: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--navy-950);
  color: var(--text-mid);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  word-break: break-word;
}

h1, h2, h3, h4 { color: var(--text-hi); font-weight: 700; line-height: 1.4; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
::selection { background: rgba(47, 123, 255, 0.45); color: #fff; }

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 12px; top: 12px; z-index: 300;
  background: var(--navy-830); color: #fff;
  padding: 8px 14px; border-radius: 8px;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.center { text-align: center; }
.muted { color: var(--text-low); font-size: 13.5px; }
.mt { margin-top: 24px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 22px; border-radius: 10px;
  font-size: 15px; font-weight: 600; line-height: 1.4;
  border: 1px solid transparent; cursor: pointer; transition: all .2s ease;
  font-family: inherit;
}
.btn-primary {
  background: linear-gradient(135deg, #2f7bff, #38bdf8);
  color: #fff;
  box-shadow: 0 8px 24px rgba(47, 123, 255, 0.35);
}
.btn-primary:hover { filter: brightness(1.12); transform: translateY(-1px); }
.btn-ghost {
  border-color: rgba(140, 170, 220, 0.35);
  color: #dbe7ff;
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover { border-color: var(--cyan-400); color: #fff; }
.btn-lg { padding: 14px 30px; font-size: 16px; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7, 13, 26, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 18px;
  height: 68px; max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-mark {
  width: 36px; height: 36px; border-radius: 9px;
  background: linear-gradient(135deg, #38bdf8, #2f7bff);
  color: #fff; font-weight: 700; font-size: 19px;
  display: inline-flex; align-items: center; justify-content: center;
}
.logo-text { color: #fff; font-weight: 700; font-size: 19px; line-height: 1.15; }
.logo-text small {
  display: block; font-size: 10px; color: var(--text-low);
  letter-spacing: 2.5px; font-weight: 500;
}
.main-nav { display: flex; gap: 2px; flex: 1; margin-left: 8px; }
.main-nav a {
  color: var(--text-mid); font-size: 15px;
  padding: 7px 12px; border-radius: 8px; white-space: nowrap;
}
.main-nav a:hover { color: #fff; background: rgba(76, 154, 255, 0.12); }
.main-nav a.active { color: #fff; background: rgba(47, 123, 255, 0.22); }
.header-cta { flex-shrink: 0; }
.nav-toggle {
  display: none;
  width: 42px; height: 40px; border-radius: 10px;
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.04);
  color: #dbe7ff; font-size: 20px; cursor: pointer;
  align-items: center; justify-content: center;
}

/* ---------------- 面包屑 ---------------- */
.crumbs {
  padding: 22px 0 4px; font-size: 13.5px; color: var(--text-low);
}
.crumbs a { color: var(--text-mid); }
.crumbs a:hover { color: var(--cyan-300); }
.crumbs .sep { margin: 0 9px; color: #4a5876; }
.crumbs b { color: #fff; font-weight: 500; }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative; overflow: hidden;
  padding: 84px 0 92px;
  background:
    radial-gradient(900px 420px at 12% -10%, rgba(47, 123, 255, 0.22), transparent 60%),
    radial-gradient(700px 380px at 88% 8%, rgba(56, 189, 248, 0.14), transparent 55%);
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.028) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.028) 0 1px, transparent 1px 46px);
  -webkit-mask-image: radial-gradient(720px 460px at 65% 18%, #000 30%, transparent 75%);
  mask-image: radial-gradient(720px 460px at 65% 18%, #000 30%, transparent 75%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: 46px; align-items: center;
}
.hero h1 { font-size: 44px; font-weight: 800; line-height: 1.3; }
.hero h1 .grad {
  background: linear-gradient(90deg, #4c9aff, #38e0f8);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { font-size: 17px; margin: 18px 0 30px; max-width: 580px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 32px; }
.tag {
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03);
  padding: 7px 14px; border-radius: 999px; font-size: 13px;
}
.tag b { color: var(--cyan-300); font-weight: 600; }
.hero-visual svg { width: 100%; max-width: 430px; display: block; margin: 0 auto; }
.pulse { animation: blink 2.2s infinite; }
@keyframes blink { 50% { opacity: 0.3; } }

/* ---------------- 子页头 ---------------- */
.page-hero {
  padding: 54px 0 34px;
  background: radial-gradient(760px 300px at 18% 0%, rgba(47, 123, 255, 0.16), transparent);
}
.page-hero h1 { font-size: 34px; font-weight: 800; }
.page-hero .lead { margin-top: 14px; max-width: 820px; }
.page-hero .hero-tags { margin-top: 22px; }

/* ---------------- 区块 ---------------- */
.section { padding: 76px 0; }
.section-alt {
  background: #0a1122;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.sec-head { max-width: 780px; margin: 0 auto 46px; text-align: center; }
.sec-head h2 { font-size: 30px; font-weight: 800; }
.sec-head .lead { margin-top: 12px; }
.sec-head.left { text-align: left; margin-left: 0; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 13px; border-radius: 999px; font-size: 13px;
  border: 1px solid rgba(76, 154, 255, 0.35);
  color: #9cc4ff; background: rgba(47, 123, 255, 0.1);
}
.sec-head .chip { margin-bottom: 14px; }

/* ---------------- 栅格与卡片 ---------------- */
.grid { display: grid; gap: 18px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: linear-gradient(180deg, #0f1a35, #0c1529);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: all .25s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 14px 40px rgba(2, 8, 20, 0.5);
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { font-size: 14.5px; }
.ico {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(47, 123, 255, 0.12);
  border: 1px solid rgba(76, 154, 255, 0.3);
  color: #6fb0ff;
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.ico svg { width: 22px; height: 22px; }

.product-card .more-link {
  display: inline-block; margin-top: 14px;
  color: #6fb0ff; font-size: 14px; font-weight: 600;
}
.product-card .more-link:hover { color: var(--cyan-300); }
.price-from { margin-top: 14px; font-size: 14px; color: var(--text-low); }
.price-from b { color: var(--cyan-300); font-size: 18px; }

.news-card h3 { font-size: 17px; }
.news-card h3 a:hover { color: var(--cyan-300); }
.news-meta { font-size: 13px; color: var(--text-low); margin-bottom: 6px; }

/* ---------------- 勾选列表 ---------------- */
.checks { display: grid; gap: 8px; margin-top: 12px; }
.checks li {
  padding-left: 24px; position: relative; font-size: 14px; line-height: 1.7;
}
.checks li::before {
  content: "✓"; position: absolute; left: 2px; top: 0;
  color: #3fd0c0; font-weight: 700;
}

/* ---------------- 表格 ---------------- */
.tbl-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}
table.tbl {
  width: 100%; border-collapse: collapse;
  min-width: 660px; font-size: 14.5px;
}
.tbl th {
  background: var(--navy-800); color: #fff; text-align: left;
  padding: 13px 16px; font-weight: 600; white-space: nowrap;
}
.tbl td {
  padding: 13px 16px; border-top: 1px solid var(--line);
  color: var(--text-mid); vertical-align: top;
}
.tbl tr:hover td { background: rgba(47, 123, 255, 0.06); }
.tbl tr.hl td { background: rgba(56, 189, 248, 0.08); }
.tbl-note { margin-top: 10px; }

/* ---------------- 套餐卡片 ---------------- */
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 34px; }
.plan {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 22px 24px; background: var(--navy-830);
  position: relative; display: flex; flex-direction: column;
}
.plan h3 { font-size: 17px; }
.plan .plan-sub { font-size: 13px; color: var(--text-low); margin-top: 4px; }
.plan-price { margin: 16px 0 4px; font-size: 30px; color: #fff; font-weight: 800; }
.plan-price em { font-style: normal; font-size: 13px; color: var(--text-low); font-weight: 400; }
.plan .checks { margin: 10px 0 20px; }
.plan .btn { margin-top: auto; }
.plan.featured {
  border-color: rgba(56, 224, 248, 0.55);
  background: linear-gradient(180deg, rgba(47, 123, 255, 0.14), var(--navy-830));
  box-shadow: 0 10px 40px rgba(47, 123, 255, 0.18);
}
.plan-badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(90deg, #2f7bff, #38bdf8);
  color: #fff; font-size: 12px; padding: 3px 13px;
  border-radius: 999px; white-space: nowrap;
}
.plans-3 { grid-template-columns: repeat(3, 1fr); }

/* ---------------- 流程步骤 ---------------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step {
  background: linear-gradient(180deg, #0f1a35, #0c1529);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px;
}
.step-num {
  width: 34px; height: 34px; border-radius: 50%;
  background: rgba(47, 123, 255, 0.15);
  border: 1px solid rgba(76, 154, 255, 0.4);
  color: #7cb6ff; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px;
}
.step h3 { font-size: 16.5px; margin-bottom: 6px; }
.step p { font-size: 14px; }

/* ---------------- FAQ ---------------- */
.faq details {
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--navy-830); margin-bottom: 12px; overflow: hidden;
}
.faq summary {
  cursor: pointer; padding: 16px 46px 16px 18px;
  color: #fff; font-weight: 600; font-size: 15.5px;
  list-style: none; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 18px; top: 50%;
  transform: translateY(-50%); color: #6fb0ff; font-size: 22px; line-height: 1;
}
.faq details[open] summary::after { content: "−"; }
.faq .faq-a { padding: 0 18px 16px; font-size: 14.5px; }

/* ---------------- 文章页 ---------------- */
.article { max-width: 840px; margin: 0 auto; }
.article-meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  font-size: 13.5px; color: var(--text-low);
  margin: 14px 0 26px;
}
.article-body h2 {
  font-size: 24px; margin: 40px 0 14px;
  padding-left: 12px; border-left: 4px solid var(--blue-500);
}
.article-body h3 { font-size: 19px; margin: 26px 0 10px; color: #dbe7ff; }
.article-body p { margin: 12px 0; }
.article-body ul, .article-body ol { margin: 12px 0 12px 22px; }
.article-body ul li { list-style: disc; margin: 6px 0; }
.article-body ol li { list-style: decimal; margin: 6px 0; }
.article-body a { color: #6fb0ff; text-decoration: underline; }
.article-body .tbl-wrap { margin: 18px 0; }
.notice {
  background: rgba(47, 123, 255, 0.08);
  border: 1px solid rgba(76, 154, 255, 0.3);
  border-radius: 12px; padding: 16px 18px;
  font-size: 14px; margin: 22px 0;
}
.notice b { color: #9cc4ff; }
.notice.warn {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.35);
}
.notice.warn b { color: #fbbf24; }

/* ---------------- CTA 横幅 ---------------- */
.cta-inner {
  border-radius: 18px; padding: 44px 38px;
  background: linear-gradient(120deg, rgba(47, 123, 255, 0.25), rgba(56, 189, 248, 0.12));
  border: 1px solid rgba(76, 154, 255, 0.35);
  display: flex; align-items: center; justify-content: space-between;
  gap: 22px; flex-wrap: wrap;
}
.cta-inner h2 { font-size: 24px; }
.cta-inner p { margin-top: 8px; font-size: 15px; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  background: #060b16; border-top: 1px solid var(--line);
  padding: 56px 0 30px;
}
.foot-grid {
  display: grid; grid-template-columns: 1.25fr 1fr 1fr 1.2fr;
  gap: 34px;
}
.foot-col h4 { font-size: 15px; margin-bottom: 14px; }
.foot-desc { font-size: 13.5px; margin-top: 14px; }
.foot-links a {
  display: block; padding: 4px 0;
  font-size: 14px; color: var(--text-mid);
}
.foot-links a:hover { color: var(--cyan-300); }
.kw-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.kw-links a { font-size: 13.5px; color: var(--text-low); }
.kw-links a:hover { color: var(--cyan-300); }
.foot-contact {
  margin-top: 28px; padding: 14px 18px;
  border: 1px dashed rgba(122, 150, 200, 0.3);
  border-radius: 12px; font-size: 14px;
}
.foot-contact b { color: #fff; }
.foot-bottom {
  border-top: 1px solid var(--line);
  margin-top: 30px; padding-top: 22px;
  display: flex; justify-content: space-between; gap: 10px;
  flex-wrap: wrap; font-size: 13px; color: var(--text-low);
}

/* ---------------- 联系页 ---------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; align-items: start; }
.info-row { display: flex; gap: 12px; padding: 11px 0; font-size: 15px; border-bottom: 1px dashed rgba(122, 150, 200, 0.14); }
.info-row:last-child { border-bottom: none; }
.info-row b { color: #fff; min-width: 86px; font-weight: 600; }
.form .field { margin-bottom: 16px; }
.form label { display: block; font-size: 14px; margin-bottom: 6px; }
.form input, .form textarea, .form select {
  width: 100%; background: #0b1428;
  border: 1px solid var(--line); border-radius: 10px;
  color: #eaf1ff; padding: 11px 14px; font-size: 15px;
  font-family: inherit; outline: none;
}
.form input:focus, .form textarea:focus, .form select:focus { border-color: var(--cyan-400); }
.form textarea { min-height: 110px; resize: vertical; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero h1 { font-size: 36px; }
  .main-nav {
    display: none;
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--navy-900); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 12px 20px 16px; gap: 4px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 10px 12px; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .header-cta { margin-left: 0; }
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .g3 { grid-template-columns: repeat(2, 1fr); }
  .plans { grid-template-columns: repeat(2, 1fr); }
  .plans-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .page-hero h1 { font-size: 28px; }
}
@media (max-width: 640px) {
  .hero { padding: 56px 0 64px; }
  .hero h1 { font-size: 30px; }
  .section { padding: 56px 0; }
  .g2, .g3, .g4, .plans, .plans-3, .steps, .split, .contact-grid { grid-template-columns: 1fr; }
  .split { gap: 24px; }
  .sec-head h2 { font-size: 24px; }
  .page-hero h1 { font-size: 24px; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .foot-grid { grid-template-columns: 1fr; }
  .header-cta { display: none; }
}