/* ============================================================
   CrystalDiskMark 中文站 - 公共样式
   配色：科技蓝系 | 浅色主题 | 圆角卡片风格
   ============================================================ */
:root {
  --primary: #1a6bff;
  --primary-dark: #0e4fd8;
  --primary-light: #e8f0ff;
  --accent: #00b4d8;
  --ink: #16233b;
  --ink-2: #45536b;
  --ink-3: #71809b;
  --bg: #f5f8ff;
  --bg-2: #ffffff;
  --line: #e3e9f5;
  --green: #10b981;
  --amber: #f59e0b;
  --red: #ef4444;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(26, 107, 255, 0.08);
  --shadow-hover: 0 16px 40px rgba(26, 107, 255, 0.16);
  --maxw: 1160px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 32px; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--ink); }
.brand svg { width: 34px; height: 34px; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--ink-2); font-size: 14.5px; padding: 8px 14px; border-radius: 8px; transition: all .2s;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-light); }
.nav-links a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
.nav-cta {
  background: var(--primary); color: #fff !important; font-weight: 600; border-radius: 8px;
  padding: 9px 18px !important; box-shadow: 0 4px 14px rgba(26,107,255,.35);
}
.nav-cta:hover { background: var(--primary-dark); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(0,180,216,.16), transparent 60%),
    radial-gradient(700px 400px at -10% 20%, rgba(26,107,255,.14), transparent 55%),
    linear-gradient(180deg, #eef4ff 0%, var(--bg) 100%);
  padding: 76px 0 60px; text-align: center; overflow: hidden;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--primary-dark);
  background: #fff; border: 1px solid #d6e4ff; padding: 6px 14px; border-radius: 999px;
  box-shadow: var(--shadow); margin-bottom: 22px;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); display: inline-block; }
.hero h1 { font-size: 46px; line-height: 1.25; letter-spacing: -0.5px; margin-bottom: 16px; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.sub { font-size: 17px; color: var(--ink-2); max-width: 720px; margin: 0 auto 30px; }
.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 38px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 30px; border-radius: 10px;
  font-size: 15px; font-weight: 600; transition: all .2s; border: none; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 24px rgba(26,107,255,.35); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); color: #fff; }
.btn-ghost { background: #fff; color: var(--ink); border: 1px solid var(--line); box-shadow: var(--shadow); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* 速度示例展示条 */
.speed-demo {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; max-width: 900px; margin: 0 auto;
}
.speed-card {
  background: #fff; border-radius: var(--radius); padding: 18px 14px; box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
.speed-card .label { font-size: 12px; color: var(--ink-3); margin-bottom: 4px; }
.speed-card .value { font-size: 24px; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
.speed-card .value small { font-size: 12px; font-weight: 500; color: var(--ink-3); }
.speed-card .tag { font-size: 11px; color: var(--ink-3); }
.speed-card.read .value { color: var(--primary); }
.speed-card.write .value { color: var(--accent); }

/* ---------- 通用区块 ---------- */
.section { padding: 72px 0; }
.section.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 46px; }
.sec-head h2 { font-size: 32px; letter-spacing: -0.3px; margin-bottom: 12px; }
.sec-head p { color: var(--ink-2); font-size: 15.5px; }
.sec-head .sub-tag {
  display: inline-block; font-size: 12.5px; color: var(--primary); background: var(--primary-light);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 14px; font-weight: 600;
}

/* 功能卡片网格 */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 24px;
  transition: all .25s; position: relative; overflow: hidden;
}
.feature-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0; transition: opacity .25s;
}
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: #c9dcff; }
.feature-card:hover::before { opacity: 1; }
.feature-card .icon {
  width: 52px; height: 52px; border-radius: 13px; display: flex; align-items: center; justify-content: center;
  background: var(--primary-light); margin-bottom: 18px;
}
.feature-card .icon svg { width: 27px; height: 27px; stroke: var(--primary); fill: none; stroke-width: 1.8; }
.feature-card h3 { font-size: 17px; margin-bottom: 8px; }
.feature-card p { font-size: 13.8px; color: var(--ink-2); }

/* 软件介绍双栏 */
.split { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 46px; align-items: center; }
.split h2 { font-size: 28px; margin-bottom: 16px; }
.split p { color: var(--ink-2); margin-bottom: 14px; font-size: 14.8px; }
.os-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.os-chip {
  background: var(--primary-light); color: var(--primary-dark); font-weight: 600; font-size: 13px;
  padding: 7px 16px; border-radius: 8px;
}
.info-panel {
  background: linear-gradient(160deg, #101f43, #1a3a8f); color: #fff; border-radius: 18px; padding: 30px;
  box-shadow: 0 20px 50px rgba(16,31,67,.35);
}
.info-panel h3 { font-size: 18px; margin-bottom: 18px; }
.info-panel ul li {
  padding: 11px 0; border-bottom: 1px dashed rgba(255,255,255,.18); font-size: 13.8px;
  display: flex; align-items: center; gap: 10px;
}
.info-panel ul li:last-child { border-bottom: none; }
.info-panel .ico { width: 22px; height: 22px; flex: none; color: #7ee2b8; }

/* 版本动态时间线 */
.timeline { max-width: 720px; margin: 0 auto; }
.tl-item { display: flex; gap: 20px; padding: 20px 0; position: relative; }
.tl-item::before { content: ""; position: absolute; left: 7px; top: 40px; bottom: -6px; width: 2px; background: var(--line); }
.tl-item:last-child::before { display: none; }
.tl-dot { width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 4px solid var(--primary); flex: none; margin-top: 6px; z-index: 1; }
.tl-body { flex: 1; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; box-shadow: var(--shadow); }
.tl-body .date { font-size: 12px; color: var(--ink-3); margin-bottom: 4px; }
.tl-body h4 { font-size: 15.5px; margin-bottom: 5px; }
.tl-body p { font-size: 13.5px; color: var(--ink-2); }

/* FAQ 折叠 */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.faq-q {
  width: 100%; text-align: left; background: none; border: none; cursor: pointer; font: inherit;
  font-size: 15px; font-weight: 600; color: var(--ink); padding: 18px 22px;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-q .arrow { color: var(--primary); transition: transform .25s; flex: none; }
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 22px 18px; color: var(--ink-2); font-size: 14px; }

/* 下载区 CTA */
.cta-band {
  background: linear-gradient(120deg, var(--primary-dark), var(--primary) 45%, var(--accent));
  border-radius: 20px; padding: 52px 40px; text-align: center; color: #fff; position: relative; overflow: hidden;
}
.cta-band::after {
  content: ""; position: absolute; width: 300px; height: 300px; border-radius: 50%;
  background: rgba(255,255,255,.08); top: -120px; right: -80px;
}
.cta-band h2 { font-size: 28px; margin-bottom: 10px; }
.cta-band p { opacity: .92; margin-bottom: 26px; }
.cta-band .btn-primary { background: #fff; color: var(--primary-dark); box-shadow: 0 10px 30px rgba(0,0,0,.2); }
.cta-band .btn-primary:hover { background: #f0f6ff; color: var(--primary-dark); transform: translateY(-2px); }
.cta-band .btn-ghost { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.4); color: #fff; }
.cta-band .btn-ghost:hover { background: rgba(255,255,255,.22); color: #fff; }

/* ---------- 子页 Hero ---------- */
.page-hero { background: linear-gradient(180deg, #e8f0ff, var(--bg)); padding: 52px 0 40px; text-align: center; }
.page-hero h1 { font-size: 34px; margin-bottom: 10px; }
.page-hero p { color: var(--ink-2); max-width: 660px; margin: 0 auto; font-size: 15.5px; }

/* ---------- 下载页 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.dl-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px;
  display: flex; flex-direction: column; box-shadow: var(--shadow); transition: all .25s; position: relative;
}
.dl-card.featured { border-color: var(--primary); box-shadow: 0 14px 40px rgba(26,107,255,.16); }
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.dl-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(90deg, var(--primary), var(--accent)); color: #fff;
  font-size: 12px; font-weight: 600; padding: 4px 14px; border-radius: 999px; white-space: nowrap;
}
.dl-card .dl-icon { width: 58px; height: 58px; border-radius: 15px; background: var(--primary-light); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.dl-card .dl-icon svg { width: 30px; height: 30px; stroke: var(--primary); fill: none; stroke-width: 1.7; }
.dl-card h3 { font-size: 18px; margin-bottom: 4px; }
.dl-card .ver { color: var(--ink-3); font-size: 13px; margin-bottom: 12px; }
.dl-card ul { margin-bottom: 18px; flex: 1; }
.dl-card ul li { font-size: 13.5px; color: var(--ink-2); padding: 5px 0; padding-left: 20px; position: relative; }
.dl-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 700; }
.dl-btns { display: flex; flex-direction: column; gap: 9px; }
.dl-btns .btn { justify-content: center; padding: 11px 16px; font-size: 14px; }
.btn-outline { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }

/* 版本历史表 */
.table-wrap { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 13.8px; }
.table-wrap thead th { background: #f0f5ff; color: var(--ink-2); text-align: left; padding: 13px 18px; font-weight: 600; border-bottom: 1px solid var(--line); white-space: nowrap; }
.table-wrap tbody td { padding: 12px 18px; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.table-wrap tbody tr:last-child td { border-bottom: none; }
.table-wrap tbody tr:hover { background: #f7faff; }
.tag-new { background: #dff7ec; color: #047857; font-size: 11.5px; font-weight: 600; padding: 2px 9px; border-radius: 999px; }
.tag-old { background: #f0f2f7; color: var(--ink-3); font-size: 11.5px; padding: 2px 9px; border-radius: 999px; }

/* ---------- 教程步骤 ---------- */
.steps { max-width: 820px; margin: 0 auto; counter-reset: step; }
.step { display: flex; gap: 22px; padding: 22px 0; }
.step-num {
  counter-increment: step; flex: none; width: 44px; height: 44px; border-radius: 12px;
  background: var(--primary); color: #fff; font-size: 19px; font-weight: 800;
  display: flex; align-items: center; justify-content: center; box-shadow: 0 8px 20px rgba(26,107,255,.3);
}
.step-num::before { content: counter(step); }
.step-body { flex: 1; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 20px 24px; box-shadow: var(--shadow); }
.step-body h3 { font-size: 16.5px; margin-bottom: 8px; }
.step-body p, .step-body li { font-size: 14px; color: var(--ink-2); }
.step-body ul { margin-top: 6px; }
.step-body ul li { padding: 3px 0; padding-left: 18px; position: relative; }
.step-body ul li::before { content: "•"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }

/* 结果解读表 */
.term-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.term-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; text-align: center; transition: all .25s; }
.term-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.term-card .code { font-family: Consolas, "Courier New", monospace; font-weight: 800; color: var(--primary); font-size: 17px; margin-bottom: 8px; display: inline-block; background: var(--primary-light); padding: 4px 14px; border-radius: 7px; }
.term-card h4 { font-size: 15px; margin-bottom: 6px; }
.term-card p { font-size: 13px; color: var(--ink-2); }

/* ---------- 关于页 ---------- */
.about-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); margin-bottom: 24px; }
.about-card h3 { font-size: 18px; margin-bottom: 14px; display: flex; align-items: center; gap: 10px; }
.about-card h3 .bar { width: 4px; height: 20px; border-radius: 2px; background: var(--primary); }
.about-card p { color: var(--ink-2); font-size: 14.5px; margin-bottom: 10px; }
.about-card p:last-child { margin-bottom: 0; }
.spec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.spec-item { background: #f7faff; border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; font-size: 13.5px; color: var(--ink-2); }
.spec-item b { color: var(--ink); display: block; margin-bottom: 2px; font-size: 14px; }

/* ---------- 页脚 ---------- */
.footer { background: #101d3d; color: #9fb0d4; padding: 56px 0 0; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 40px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer a { color: #9fb0d4; font-size: 13.5px; display: block; padding: 4px 0; }
.footer a:hover { color: #fff; }
.footer .brand { color: #fff; margin-bottom: 12px; }
.footer .desc { font-size: 13px; line-height: 1.8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 18px 0; text-align: center; font-size: 12.5px; color: #6b7ba3; }

/* 回到顶部 */
#toTop {
  position: fixed; right: 26px; bottom: 26px; width: 44px; height: 44px; border-radius: 12px;
  background: var(--primary); color: #fff; border: none; font-size: 18px; cursor: pointer;
  box-shadow: 0 8px 24px rgba(26,107,255,.4); opacity: 0; pointer-events: none; transition: all .3s; z-index: 90;
}
#toTop.show { opacity: 1; pointer-events: auto; }
#toTop:hover { background: var(--primary-dark); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .feature-grid, .dl-grid, .term-grid { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .speed-demo { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links {
    display: none; position: absolute; top: 66px; left: 0; right: 0; background: #fff;
    flex-direction: column; padding: 14px; border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-inner { gap: 12px; }
  .nav-cta { display: none; }
  .hero h1 { font-size: 32px; }
  .spec-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .feature-grid, .dl-grid, .term-grid, .speed-demo { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
  .hero { padding: 52px 0 44px; }
  .cta-band { padding: 40px 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .table-wrap { overflow-x: auto; }
}