/* CloudDrive 官网 · 纯静态样式，无外部字体 / CDN / 框架依赖 */

:root {
  --navy: #16243c;
  --navy-deep: #101c30;
  --navy-soft: #1e3050;
  --blue: #2f6bdb;
  --blue-dark: #2457b8;
  --blue-soft: #eaf1fd;
  --amber: #f0b23e;
  --amber-soft: #fdf3dd;
  --green: #2fa36b;
  --ink: #17223a;
  --ink-2: #42526e;
  --ink-3: #74829b;
  --line: #e3e9f3;
  --bg-soft: #f6f8fc;
  --white: #ffffff;
  --radius: 16px;
  --shadow-sm: 0 2px 12px rgba(22, 36, 60, .06);
  --shadow-md: 0 18px 45px rgba(22, 36, 60, .10);
  --shadow-lg: 0 30px 70px rgba(16, 28, 48, .18);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--blue-soft);
  color: var(--blue-dark);
  padding: .12em .42em;
  border-radius: 5px;
  white-space: nowrap;
}
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }
::selection { background: #c9dcff; color: var(--navy-deep); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon {
  width: 1em; height: 1em; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
  vertical-align: -.13em;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 200;
  background: var(--blue); color: #fff; padding: 10px 18px; border-radius: 8px;
}
.skip-link:focus { top: 12px; }

.container { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.container-narrow { width: min(860px, calc(100% - 48px)); }
.section { padding: 100px 0; }
.section-soft { background: var(--bg-soft); }
.section-dark { background: var(--navy); color: #fff; position: relative; overflow: hidden; }
.section-dark::before {
  content: ""; position: absolute; width: 720px; height: 720px; border-radius: 50%;
  right: -240px; top: -280px;
  background: radial-gradient(circle, rgba(47, 107, 219, .22), transparent 68%);
  pointer-events: none;
}
.section-dark > .container { position: relative; z-index: 1; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  border: 1px solid transparent; border-radius: 10px;
  padding: 12px 22px; font-size: 15px; font-weight: 600; line-height: 1.4;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn .icon { font-size: 17px; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 8px 20px rgba(47, 107, 219, .24); }
.btn-primary:hover { background: var(--blue-dark); box-shadow: 0 12px 26px rgba(47, 107, 219, .32); }
.btn-outline { background: transparent; border-color: #cbd6e8; color: var(--ink); }
.btn-outline:hover { border-color: var(--blue); color: var(--blue); background: #f8fbff; }
.btn-ghost { background: transparent; color: var(--ink-2); border-color: var(--line); }
.btn-ghost:hover { color: var(--blue); border-color: var(--blue); }
.btn-light { background: #fff; color: var(--blue-dark); }
.btn-light:hover { background: #f0f5ff; }
.btn-outline-light { border-color: rgba(255, 255, 255, .45); color: #fff; background: transparent; }
.btn-outline-light:hover { background: rgba(255, 255, 255, .12); }
.btn-sm { padding: 9px 16px; font-size: 14px; border-radius: 9px; }
.btn-lg { padding: 15px 28px; font-size: 16px; border-radius: 11px; }
.btn-block { display: flex; width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(227, 233, 243, .8);
  transition: box-shadow .25s ease, background .25s ease;
}
.site-header.is-scrolled { box-shadow: 0 6px 24px rgba(22, 36, 60, .08); background: rgba(255, 255, 255, .96); }
.nav-inner { display: flex; align-items: center; gap: 28px; min-height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: none; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(145deg, #2f6bdb, #1d4ea8);
  color: #fff; display: grid; place-items: center;
  box-shadow: 0 5px 14px rgba(47, 107, 219, .28);
}
.brand-mark .icon { font-size: 23px; stroke-width: 1.9; }
.brand-text { display: flex; flex-direction: column; font-size: 18px; font-weight: 700; line-height: 1.25; letter-spacing: -.2px; }
.brand-text small { font-size: 10.5px; font-weight: 500; color: var(--ink-3); letter-spacing: .1px; }
.nav-links { display: flex; align-items: center; gap: 24px; margin-left: auto; }
.nav-links a { font-size: 14px; color: var(--ink-2); font-weight: 500; position: relative; padding: 6px 0; transition: color .2s ease; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 2px;
  background: var(--blue); border-radius: 2px; transition: right .25s ease;
}
.nav-links a:hover, .nav-links a.is-current { color: var(--blue); }
.nav-links a:hover::after, .nav-links a.is-current::after { right: 0; }
.nav-actions { display: flex; align-items: center; gap: 10px; flex: none; }
.nav-toggle {
  display: none; width: 40px; height: 40px; border-radius: 9px;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  align-items: center; justify-content: center;
}
.nav-toggle .icon { font-size: 21px; }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 84px 0 72px; overflow: hidden; background: linear-gradient(180deg, #f9fbff 0%, #eef3fc 58%, #ffffff 100%); }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(rgba(47, 107, 219, .11) 1px, transparent 1px);
  background-size: 26px 26px; mask-image: linear-gradient(180deg, #000 0%, transparent 72%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 72%);
}
.hero-glow {
  position: absolute; width: 620px; height: 620px; border-radius: 50%;
  right: -180px; top: -220px; pointer-events: none;
  background: radial-gradient(circle, rgba(47, 107, 219, .16), transparent 66%);
}
.hero-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1.12fr; gap: 56px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  background: #fff; border: 1px solid #d9e4f8; color: var(--blue-dark);
  border-radius: 999px; padding: 7px 15px; font-size: 13px; font-weight: 600;
  box-shadow: var(--shadow-sm);
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 4px rgba(47, 107, 219, .14); }
.hero h1 {
  font-size: clamp(30px, 3.1vw, 43px); line-height: 1.32; letter-spacing: -.9px;
  margin: 24px 0 20px; font-weight: 800;
}
.hero h1 .hero-title-line { white-space: nowrap; }
.hero h1 .accent { color: var(--blue); }
.hero-lead { font-size: 16.5px; color: var(--ink-2); max-width: 540px; line-height: 1.86; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-note { display: flex; align-items: center; gap: 7px; margin-top: 20px; font-size: 13.5px; color: var(--ink-3); }
.hero-note .icon { color: var(--green); font-size: 16px; }

.hero-visual { position: relative; padding: 10px 0 26px; }
.browser-window {
  background: #fff; border: 1px solid #dde5f1; border-radius: 15px;
  overflow: hidden; box-shadow: var(--shadow-lg);
}
.browser-bar {
  display: flex; align-items: center; gap: 14px; padding: 11px 16px;
  background: #f4f7fc; border-bottom: 1px solid #e7edf6;
}
.dots { display: inline-flex; gap: 6px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: #d5deed; }
.dots i:first-child { background: #f3a9a2; }
.dots i:nth-child(2) { background: #f2cc84; }
.dots i:last-child { background: #a6d6ae; }
.address {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; border: 1px solid #e4eaf4; border-radius: 7px;
  padding: 4px 14px; font-size: 11.5px; color: var(--ink-3); font-family: var(--mono);
  margin-inline: auto; min-width: 240px; justify-content: center;
}
.address .icon { font-size: 12px; color: #6f9bd8; }
.browser-body img { width: 100%; height: auto; }
.float-card {
  position: absolute; z-index: 2; display: flex; align-items: center; gap: 11px;
  background: #fff; border: 1px solid #e5ebf5; border-radius: 12px;
  padding: 11px 15px; box-shadow: var(--shadow-md);
}
.float-card strong { display: block; font-size: 13px; line-height: 1.4; }
.float-card small { display: block; font-size: 11.5px; color: var(--ink-3); line-height: 1.4; }
.float-icon {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: var(--blue-soft); color: var(--blue); display: grid; place-items: center;
}
.float-icon .icon { font-size: 19px; }
.float-icon.amber { background: var(--amber-soft); color: #c4881d; }
.float-card-top { top: -12px; right: 14px; }
.float-card-bottom { bottom: -14px; left: -20px; }

.metric-strip {
  position: relative; z-index: 1; margin-top: 66px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: #fff; border: 1px solid var(--line); border-radius: 15px;
  box-shadow: var(--shadow-sm); overflow: hidden;
}
.metric { padding: 24px 28px; text-align: center; border-right: 1px solid var(--line); }
.metric:last-child { border-right: 0; }
.metric strong { display: block; font-size: 30px; font-weight: 800; color: var(--blue); line-height: 1.2; letter-spacing: -.7px; }
.metric span { display: block; font-size: 13.5px; color: var(--ink-3); margin-top: 4px; }

/* ---------- 区块标题 ---------- */
.section-head { margin-bottom: 52px; }
.section-head.center { text-align: center; max-width: 780px; margin-inline: auto; }
.kicker {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1.7px;
  color: var(--blue); text-transform: uppercase; margin-bottom: 14px;
}
.kicker.light { color: #8fb4ff; }
.section-head h2 { font-size: clamp(27px, 2.8vw, 38px); line-height: 1.38; letter-spacing: -.6px; font-weight: 800; }
.section-head p { margin-top: 15px; font-size: 16px; color: var(--ink-2); line-height: 1.85; }

/* ---------- 价值对比 ---------- */
.contrast-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contrast-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s ease, box-shadow .25s ease;
}
.contrast-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.contrast-problem { background: #f7f9fd; padding: 26px 26px 24px; border-bottom: 1px solid var(--line); }
.contrast-solution { padding: 26px; }
.contrast-card .label { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; color: var(--ink-3); letter-spacing: .4px; }
.contrast-solution .label { color: var(--blue); }
.contrast-solution .label .icon { font-size: 15px; }
.contrast-card p { margin-top: 12px; font-size: 14.5px; line-height: 1.85; color: var(--ink-2); }
.contrast-solution p { color: var(--ink); }

/* ---------- 核心能力 ---------- */
.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: 30px; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #cbdcf7; }
.feature-icon {
  width: 50px; height: 50px; border-radius: 13px; display: grid; place-items: center;
  background: var(--blue-soft); color: var(--blue); margin-bottom: 20px;
}
.feature-icon .icon { font-size: 25px; }
.feature-card:nth-child(3n+2) .feature-icon { background: var(--amber-soft); color: #c4881d; }
.feature-card h3 { font-size: 19px; font-weight: 700; letter-spacing: -.2px; }
.feature-card p { margin-top: 10px; font-size: 14.5px; color: var(--ink-2); line-height: 1.85; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.tags span { font-size: 12px; color: var(--ink-3); background: #f4f7fc; border: 1px solid #e9eef7; padding: 3px 10px; border-radius: 999px; }

/* ---------- 存储架构 ---------- */
.arch-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 64px; align-items: center; }
.arch-copy h2 { font-size: clamp(26px, 2.6vw, 35px); line-height: 1.4; letter-spacing: -.6px; margin: 14px 0 18px; font-weight: 800; }
.arch-copy > p { color: #b9c8df; font-size: 15.5px; line-height: 1.9; }
.section-dark code { background: rgba(120, 165, 245, .16); color: #a9c8ff; }
.check-list { margin-top: 26px; display: grid; gap: 13px; }
.check-list li { display: flex; gap: 11px; align-items: flex-start; font-size: 14.5px; color: #d3ddec; line-height: 1.75; }
.check-list .icon { font-size: 15px; color: #7fb0ff; margin-top: 5px; }
.arch-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.arch-stack span { font-size: 12px; color: #a9bede; border: 1px solid rgba(255, 255, 255, .18); border-radius: 7px; padding: 5px 11px; font-family: var(--mono); }

.arch-diagram {
  background: rgba(255, 255, 255, .055); border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 20px; padding: 28px 24px 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .2);
}
.diag-client, .diag-core {
  display: flex; align-items: center; gap: 14px;
  background: rgba(255, 255, 255, .09); border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 13px; padding: 14px 18px;
}
.diag-client { max-width: 330px; margin-inline: auto; }
.diag-icon { width: 38px; height: 38px; border-radius: 10px; background: rgba(47, 107, 219, .32); color: #b9d2ff; display: grid; place-items: center; flex: none; }
.diag-icon .icon { font-size: 20px; }
.diag-icon.amber { background: rgba(240, 178, 62, .22); color: #f6cd7f; }
.diag-client strong, .diag-core strong { display: block; font-size: 14.5px; line-height: 1.5; }
.diag-client small, .diag-core small { display: block; font-size: 11.5px; color: #a9bede; line-height: 1.5; }
.diag-line { width: 2px; height: 26px; background: rgba(255, 255, 255, .22); margin: 0 auto; }
.diag-core {
  background: linear-gradient(135deg, rgba(47, 107, 219, .42), rgba(36, 87, 184, .26));
  border-color: rgba(150, 190, 255, .4); flex-direction: column; text-align: center;
  padding: 20px; gap: 9px;
}
.diag-core .diag-icon { background: rgba(255, 255, 255, .16); color: #fff; width: 44px; height: 44px; }
.diag-core .icon { font-size: 23px; }
.diag-core strong { font-size: 16px; }
.diag-branch { position: relative; padding-top: 26px; }
.diag-branch::before { content: ""; position: absolute; top: 0; left: 50%; width: 2px; height: 26px; background: rgba(255, 255, 255, .22); }
.diag-nodes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.diag-node {
  background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 12px; padding: 16px 10px; text-align: center;
}
.diag-node .diag-icon { width: 34px; height: 34px; margin: 0 auto 10px; }
.diag-node .icon { font-size: 18px; }
.diag-node strong { display: block; font-size: 13px; }
.diag-node small { display: block; font-size: 11px; color: #9fb2d0; margin-top: 3px; font-family: var(--mono); }

/* ---------- 安全 ---------- */
.security-grid { display: grid; grid-template-columns: 1.22fr .78fr; gap: 48px; align-items: start; }
.security-list article { display: flex; gap: 17px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.security-list article:first-child { padding-top: 0; }
.security-list article:last-child { border-bottom: 0; }
.sec-icon { width: 44px; height: 44px; border-radius: 12px; background: var(--blue-soft); color: var(--blue); display: grid; place-items: center; flex: none; }
.sec-icon .icon { font-size: 22px; }
.security-list h3 { font-size: 17px; font-weight: 700; }
.security-list p { margin-top: 6px; font-size: 14.5px; color: var(--ink-2); line-height: 1.82; }
.security-aside {
  background: var(--navy); color: #fff; border-radius: 20px; padding: 34px;
  box-shadow: var(--shadow-md);
}
.aside-label { font-size: 12px; letter-spacing: 1.5px; color: #8fb4ff; font-weight: 700; }
.security-aside h3 { font-size: 22px; margin: 10px 0 20px; font-weight: 700; }
.security-aside ol { display: grid; gap: 12px; }
.security-aside li { display: flex; gap: 10px; align-items: center; font-size: 14.5px; color: #d9e3f2; }
.security-aside li .icon { font-size: 15px; color: #7fb0ff; }
.aside-foot { margin-top: 22px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .14); font-size: 12.5px; color: #9fb2d0; }

/* ---------- 界面预览 ---------- */
.showcase { max-width: 1000px; margin-inline: auto; }
.showcase-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 26px; }
.tab {
  display: inline-flex; align-items: center; gap: 7px;
  background: #fff; border: 1px solid var(--line); color: var(--ink-2);
  border-radius: 999px; padding: 9px 18px; font-size: 14px; font-weight: 500;
  transition: all .2s ease;
}
.tab .icon { font-size: 16px; }
.tab:hover { border-color: #b9cef2; color: var(--blue); }
.tab.is-active { background: var(--blue); border-color: var(--blue); color: #fff; box-shadow: 0 6px 16px rgba(47, 107, 219, .22); }
.showcase-stage {
  background: #fff; border: 1px solid var(--line); border-radius: 20px;
  padding: 20px; box-shadow: var(--shadow-md);
}
.shot { display: none; }
.shot.is-active { display: block; animation: fadeIn .35s ease; }
.shot img { width: 100%; height: auto; border: 1px solid #e8edf5; border-radius: 10px; }
.shot figcaption { text-align: center; font-size: 13.5px; color: var(--ink-3); margin-top: 15px; }
.shot-mobile img { width: 288px; max-width: 100%; margin-inline: auto; border: 7px solid #dfe6f2; border-radius: 26px; }
.shot-login img { width: min(760px, 100%); margin-inline: auto; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- 适用场景 ---------- */
.scenario-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.scenario {
  text-align: center; padding: 28px 18px; border: 1px solid var(--line);
  border-radius: 14px; transition: transform .25s ease, box-shadow .25s ease;
}
.scenario:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.scenario-icon { width: 46px; height: 46px; border-radius: 50%; background: var(--blue-soft); color: var(--blue); display: grid; place-items: center; margin: 0 auto 16px; }
.scenario-icon .icon { font-size: 22px; }
.scenario h3 { font-size: 16px; font-weight: 700; }
.scenario p { margin-top: 8px; font-size: 13.5px; color: var(--ink-2); line-height: 1.75; }

/* ---------- 版本与报价 ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.price-card {
  position: relative; display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--line); border-radius: 20px;
  padding: 32px 28px; transition: transform .25s ease, box-shadow .25s ease;
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.price-head h3 { font-size: 21px; font-weight: 800; letter-spacing: -.3px; }
.price-sub { margin-top: 8px; font-size: 13.5px; color: var(--ink-3); line-height: 1.7; min-height: 46px; }
.price-tag {
  margin-top: 18px; padding: 14px 18px 15px; border-radius: 12px;
  background: var(--bg-soft); border: 1px solid #e8eef8;
  color: var(--ink);
}
.price-tag .price-amount {
  display: block; font-size: 36px; font-weight: 800; line-height: 1.1; letter-spacing: -1.4px;
}
.price-tag .price-amount small { font-size: 18px; font-weight: 700; margin-right: 2px; letter-spacing: 0; }
.price-tag .price-unit { display: block; font-size: 12.5px; font-weight: 500; color: var(--ink-3); letter-spacing: 0; margin-top: 5px; }
.price-list { display: grid; gap: 11px; margin: 22px 0 26px; }
.price-list li { display: flex; gap: 9px; align-items: flex-start; font-size: 14px; color: var(--ink-2); line-height: 1.65; }
.price-list .icon { font-size: 15px; color: var(--green); margin-top: 4px; flex: none; }
.price-card .btn { margin-top: auto; }

.price-card-featured {
  background: var(--navy); border-color: var(--navy); color: #fff;
  box-shadow: var(--shadow-lg); transform: translateY(-8px);
}
.price-card-featured:hover { transform: translateY(-12px); }
.price-card-featured .price-sub { color: #a9bede; }
.price-card-featured .price-tag { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .16); color: #fff; }
.price-card-featured .price-tag .price-amount { color: #fff; }
.price-card-featured .price-tag .price-unit { color: #9fb2d0; }
.price-card-featured .price-list li { color: #cbd8eb; }
.price-card-featured .price-list .icon { color: #7fb0ff; }
.price-flag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--blue); color: #fff; font-size: 12px; font-weight: 700;
  padding: 5px 14px; border-radius: 999px; white-space: nowrap;
  box-shadow: 0 6px 16px rgba(47, 107, 219, .35);
}

.matrix-wrap { margin-top: 52px; background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 30px 30px 24px; box-shadow: var(--shadow-sm); }
.matrix-title { font-size: 18px; font-weight: 700; margin-bottom: 18px; }
.matrix-scroll-hint { display: none; font-size: 12.5px; color: var(--ink-3); margin: -8px 0 14px; }
.matrix { width: 100%; border-collapse: collapse; font-size: 14px; }
.matrix th, .matrix td { padding: 13px 14px; text-align: center; border-bottom: 1px solid var(--line); }
.matrix thead th { font-size: 13px; font-weight: 700; color: var(--ink-3); letter-spacing: .3px; background: #f9fbfe; }
.matrix thead th:first-child { text-align: left; border-radius: 10px 0 0 0; }
.matrix thead th:last-child { border-radius: 0 10px 0 0; }
.matrix tbody th { text-align: left; font-weight: 600; color: var(--ink); }
.matrix tbody td { color: var(--ink-2); }
.matrix tbody tr:last-child th, .matrix tbody tr:last-child td { border-bottom: 0; }
.matrix tbody tr:hover { background: #fafcff; }
.matrix-note { margin-top: 18px; font-size: 13px; color: var(--ink-3); line-height: 1.7; }

/* ---------- 交付流程 ---------- */
.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
.process-step {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: 16px; padding: 28px 24px;
}
.process-step::after {
  content: ""; position: absolute; top: 46px; right: -14px; width: 8px; height: 8px;
  border-top: 2px solid #cfdbee; border-right: 2px solid #cfdbee; transform: rotate(45deg);
}
.process-step:last-child::after { display: none; }
.process-num {
  display: inline-block; font-family: var(--mono); font-size: 13px; font-weight: 700;
  color: var(--blue); background: var(--blue-soft); padding: 3px 10px; border-radius: 6px;
}
.process-step h3 { font-size: 17px; font-weight: 700; margin: 14px 0 8px; }
.process-step p { font-size: 14px; color: var(--ink-2); line-height: 1.8; }

/* ---------- FAQ ---------- */
.faq-list { background: #fff; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 0; }
.faq-list summary {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 21px 26px; font-size: 16px; font-weight: 600; cursor: pointer;
  list-style: none; transition: background .2s ease, color .2s ease;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary:hover { background: #f8fbff; color: var(--blue); }
.faq-list details[open] summary { color: var(--blue); }
.faq-plus { position: relative; width: 18px; height: 18px; flex: none; }
.faq-plus::before, .faq-plus::after {
  content: ""; position: absolute; background: currentColor; border-radius: 2px;
  top: 50%; left: 50%; transform: translate(-50%, -50%); transition: transform .25s ease;
}
.faq-plus::before { width: 16px; height: 2px; }
.faq-plus::after { width: 2px; height: 16px; }
.faq-list details[open] .faq-plus::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }
.faq-list details > div { padding: 0 26px 22px; }
.faq-list details p { font-size: 14.5px; color: var(--ink-2); line-height: 1.9; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: 56px; align-items: start; }
.contact-copy h2 { font-size: clamp(26px, 2.7vw, 36px); line-height: 1.35; letter-spacing: -.6px; font-weight: 800; margin: 14px 0 18px; }
.contact-copy > p { font-size: 15.5px; color: var(--ink-2); line-height: 1.9; }
.contact-list { display: grid; gap: 18px; margin: 32px 0 0; }
.contact-list li { display: flex; gap: 14px; align-items: flex-start; }
.contact-icon {
  width: 40px; height: 40px; border-radius: 11px; flex: none;
  background: var(--blue-soft); color: var(--blue); display: grid; place-items: center;
}
.contact-icon .icon { font-size: 20px; }
.contact-list strong { display: block; font-size: 14px; font-weight: 700; }
.contact-list a, .contact-list span { display: block; font-size: 14px; color: var(--ink-2); line-height: 1.7; word-break: break-all; }
.contact-list a:hover { color: var(--blue); }
.contact-note {
  display: flex; gap: 12px; align-items: flex-start; margin-top: 30px;
  background: #f3f7ff; border: 1px solid #dbe7fb; border-radius: 14px; padding: 18px 20px;
}
.contact-note .icon { font-size: 20px; color: var(--blue); flex: none; margin-top: 2px; }
.contact-note p { font-size: 13.5px; color: var(--ink-2); line-height: 1.8; }

.contact-card {
  background: #fff; border: 1px solid var(--line); border-radius: 20px;
  padding: 34px; box-shadow: var(--shadow-md);
}
.contact-card h3 { font-size: 20px; font-weight: 800; letter-spacing: -.3px; margin-bottom: 22px; }
.contact-form { display: grid; gap: 16px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; font-weight: 600; color: var(--ink-2); }
.field label span { color: #d9534f; }
.field input, .field select, .field textarea {
  width: 100%; font: inherit; font-size: 14.5px; color: var(--ink);
  background: #fbfcfe; border: 1px solid #dfe6f2; border-radius: 10px;
  padding: 11px 13px; transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.field textarea { resize: vertical; min-height: 96px; line-height: 1.7; }
.field input::placeholder, .field textarea::placeholder { color: #a6b1c4; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; background: #fff; border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(47, 107, 219, .14);
}
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"] { border-color: #d9534f; background: #fff8f8; }
.form-hint { font-size: 12.5px; color: var(--ink-3); line-height: 1.7; }
.form-hint.is-error { color: #c9403b; }
.form-hint.is-ok { color: var(--green); }

/* ---------- 底部 CTA ---------- */
.cta-band { background: linear-gradient(120deg, #16243c 0%, #1e3a69 60%, #2457b8 100%); color: #fff; padding: 72px 0; position: relative; overflow: hidden; }
.cta-band::after { content: ""; position: absolute; width: 480px; height: 480px; border-radius: 50%; right: -120px; bottom: -300px; background: radial-gradient(circle, rgba(255, 255, 255, .09), transparent 68%); }
.cta-inner { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 36px; flex-wrap: wrap; }
.cta-inner h2 { font-size: clamp(25px, 2.6vw, 34px); font-weight: 800; letter-spacing: -.5px; }
.cta-inner p { margin-top: 10px; color: #c3d3ec; font-size: 15.5px; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: #fff; border-top: 1px solid var(--line); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 48px; }
.footer-brand p { margin-top: 16px; font-size: 14px; color: var(--ink-2); max-width: 300px; }
.footer-col h4 { font-size: 14px; font-weight: 700; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: var(--ink-3); padding: 5px 0; transition: color .2s ease; }
.footer-col a:hover { color: var(--blue); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--line); padding: 20px 0 26px; font-size: 12.5px; color: var(--ink-3); }

/* ---------- 滚动显现 ---------- */
.js .reveal { opacity: 0; transform: translateY(20px); }
.js .reveal.is-visible { opacity: 1; transform: none; transition: opacity .65s ease, transform .65s cubic-bezier(.2, .7, .3, 1); }

/* ---------- 响应式 ---------- */
@media (max-width: 1120px) {
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 13px; }
  .hero-grid { gap: 34px; }
  .pricing-grid { gap: 16px; }
  .price-card { padding: 28px 22px; }
}

@media (max-width: 1020px) {
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    display: none; flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md); padding: 12px 24px 20px;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 12px 4px; border-bottom: 1px solid #f0f3f9; font-size: 15px; }
  .nav-links a::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-actions { margin-left: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 46px; }
  .hero-copy { max-width: 720px; }
  .hero-visual { max-width: 720px; width: 100%; margin-inline: auto; }
  .arch-grid { grid-template-columns: 1fr; gap: 44px; }
  .security-grid { grid-template-columns: 1fr; gap: 34px; }
  .contrast-grid, .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: repeat(3, 1fr); }
  .diag-nodes { gap: 12px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .price-card-featured { transform: none; }
  .price-card-featured:hover { transform: translateY(-4px); }
  .price-sub { min-height: 0; }
  .process { grid-template-columns: repeat(2, 1fr); }
  .process-step:nth-child(2n)::after { display: none; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 720px) {
  .container, .container-narrow { width: calc(100% - 36px); }
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 38px; }
  .hero { padding: 56px 0 60px; }
  .hero h1 { font-size: clamp(28px, 7vw, 38px); }
  .metric-strip { grid-template-columns: repeat(2, 1fr); margin-top: 44px; }
  .metric { padding: 18px 14px; border-bottom: 1px solid var(--line); }
  .metric:nth-child(2n) { border-right: 0; }
  .metric:nth-child(n+3) { border-bottom: 0; }
  .metric strong { font-size: 26px; }
  .float-card { padding: 8px 11px; }
  .float-card-bottom { left: -6px; }
  .float-card-top { right: -4px; }
  .float-card small { display: none; }
  .contrast-grid, .feature-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .security-aside { padding: 28px; }
  .showcase-tabs { flex-wrap: nowrap; overflow-x: auto; justify-content: flex-start; padding-bottom: 6px; -webkit-overflow-scrolling: touch; }
  .showcase-tabs .tab { flex: none; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .footer-bottom { flex-direction: column; gap: 6px; }
  .matrix-wrap { padding: 22px 16px 18px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .matrix-scroll-hint { display: block; }
  .matrix { min-width: 520px; }
  .matrix th, .matrix td { padding: 11px 10px; font-size: 13px; }
  .contact-card { padding: 26px 22px; }
  .field-row { grid-template-columns: 1fr; }
  .process { grid-template-columns: 1fr; }
  .process-step::after { display: none; }
}

@media (max-width: 480px) {
  .brand-text small { display: none; }
  .nav-actions .btn-ghost { display: none; }
  .hero-actions .btn, .cta-actions .btn { width: 100%; }
  .scenario-grid { grid-template-columns: 1fr; }
  .diag-nodes { grid-template-columns: 1fr; }
  .diag-node { display: flex; align-items: center; gap: 12px; text-align: left; padding: 12px 14px; }
  .diag-node .diag-icon { margin: 0; }
  .diag-node small { margin-top: 0; }
  .showcase-stage { padding: 12px; }
  .faq-list summary { padding: 18px; font-size: 15px; }
  .faq-list details > div { padding: 0 18px 18px; }
  .float-card-top { display: none; }
  .hero h1 .hero-title-line { white-space: normal; }
  .price-flag { font-size: 11px; padding: 4px 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}