/* 无忧链接官网 wuyoulianjie.homes — 官网矩阵旗舰站，科技感/商业感产品官网设计系统（v4 完整重构）。
   深色科技底色 + 蓝紫青渐变强调色 + 玻璃质感卡片 + 网格/光晕背景。原创设计，未复制任何第三方站点。 */

:root {
  --bg: #0a0d14;
  --bg-alt: #0d1119;
  --bg-panel: #10151f;
  --ink: #f2f5fa;
  --ink-soft: #9aa4b3;
  --ink-dim: #6b7484;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --glass: rgba(255, 255, 255, 0.035);
  --glass-hover: rgba(255, 255, 255, 0.06);
  --accent: #5b7cfa;
  --accent2: #8b5cf6;
  --accent3: #22d3ee;
  --accent-rgb: 91, 124, 250;
  --accent2-rgb: 139, 92, 246;
  --accent3-rgb: 34, 211, 238;
  --radius: 16px;
  --radius-sm: 10px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, Menlo, monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent3); text-decoration: none; }
a:hover { text-decoration: underline; }

/* announcement bar */
.announce-bar { background: var(--bg-alt); color: var(--ink-soft); text-align: center; font-size: 12.5px; padding: 9px 20px; border-bottom: 1px solid var(--border); }
.announce-bar a { color: var(--accent3); font-weight: 700; text-decoration: none; }
.announce-bar a:hover { text-decoration: underline; }

/* header */
.site-header { background: rgba(10, 13, 20, 0.75); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 40; }
.header-inner { max-width: 1140px; margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand-mark { width: 34px; height: 34px; border-radius: 9px; background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 15px; color: #fff; box-shadow: 0 0 18px rgba(var(--accent-rgb), 0.35); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-cn { font-weight: 700; font-size: 16px; letter-spacing: 0.3px; }
.brand-en { font-size: 10px; letter-spacing: 1.5px; color: var(--ink-dim); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; width: 32px; height: 32px; flex-direction: column; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 100%; height: 1.5px; background: var(--ink); }

.nav-wrap { display: flex; align-items: center; gap: 22px; }
.site-nav { display: flex; gap: 24px; }
.site-nav a { color: var(--ink-soft); font-size: 14px; }
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--ink); }

/* breadcrumb */
.breadcrumb { max-width: 1140px; margin: 16px auto 0; padding: 0 24px; font-size: 12.5px; color: var(--ink-dim); }
.breadcrumb a { color: var(--ink-dim); }

/* layout */
.page-wrap { max-width: 780px; margin: 0 auto; padding: 30px 24px 90px; }
.page-wrap.is-wide { max-width: none; padding: 0 0 90px; }

h1 { font-size: 34px; line-height: 1.3; margin: 10px 0 20px; letter-spacing: -0.3px; }
h2 { font-size: 28px; margin: 0 0 14px; letter-spacing: -0.3px; }
h3 { font-size: 16.5px; margin: 22px 0 10px; }
p { font-size: 15.5px; color: var(--ink-soft); margin: 0 0 16px; }
p.lede { font-size: 17px; color: var(--ink-soft); max-width: 620px; }
ul, ol { margin: 0 0 18px 22px; color: var(--ink-soft); }
li { margin-bottom: 7px; }
code { font-family: var(--mono); background: rgba(255, 255, 255, 0.06); padding: 1px 6px; border-radius: 4px; font-size: 13px; color: var(--accent3); }

/* buttons */
.btn-cta { display: inline-block; background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%); color: #fff !important; padding: 13px 28px; border-radius: 999px; font-weight: 700; font-size: 15px; text-decoration: none !important; box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.06) inset, 0 8px 24px rgba(var(--accent-rgb), 0.28); transition: box-shadow 0.2s, transform 0.2s; }
.btn-cta:hover { box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1) inset, 0 10px 30px rgba(var(--accent-rgb), 0.4); transform: translateY(-1px); text-decoration: none; }
.btn-cta-sm { padding: 9px 20px; font-size: 13px; }
.btn-secondary { display: inline-block; background: var(--glass); color: var(--ink) !important; padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 15px; border: 1px solid var(--border-strong); text-decoration: none !important; transition: background 0.2s, border-color 0.2s; }
.btn-secondary:hover { background: var(--glass-hover); border-color: rgba(255, 255, 255, 0.28); text-decoration: none; }

.glass-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }

/* ============ HERO ============ */
.hero {
  position: relative;
  overflow: hidden;
  width: 100vw;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  margin-top: -30px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: center top;
}
.hero::before {
  content: ""; position: absolute; top: -220px; left: 8%; width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--accent-rgb), 0.28) 0%, rgba(var(--accent-rgb), 0) 68%); pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; top: -100px; right: 4%; width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--accent2-rgb), 0.22) 0%, rgba(var(--accent2-rgb), 0) 68%); pointer-events: none;
}
.hero-inner { position: relative; max-width: 1140px; margin: 0 auto; padding: 72px 24px 40px; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.hero-eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent3); font-weight: 700; margin-bottom: 20px; padding: 6px 14px; border: 1px solid var(--border-strong); border-radius: 999px; background: var(--glass); }
.hero h1 { font-size: 52px; margin: 0 0 18px; background: linear-gradient(135deg, #ffffff 20%, #c9d3ff 100%); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p.lede { font-size: 18.5px; max-width: 520px; margin-bottom: 30px; color: var(--ink-soft); }
.hero-cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; }
.badge { display: inline-flex; align-items: center; gap: 7px; padding: 7px 14px; border-radius: 999px; background: var(--glass); border: 1px solid var(--border); font-size: 12.5px; font-weight: 600; color: var(--ink-soft); }
.badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent3); box-shadow: 0 0 8px rgba(var(--accent3-rgb), 0.8); flex-shrink: 0; }

/* Hero visual: pure CSS/HTML concept UI mockup, explicitly labeled as non-real screenshot */
.hero-visual { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; padding: 10px 0; }
.visual-stage { position: relative; width: 100%; max-width: 380px; }
.device-mock { position: relative; padding: 20px 20px 24px; box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4); }
.device-mock-bar { display: flex; gap: 6px; margin-bottom: 16px; }
.device-mock-bar span { width: 8px; height: 8px; border-radius: 50%; background: rgba(255, 255, 255, 0.18); }
.device-mock-status { display: flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 700; color: var(--ink); margin-bottom: 16px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #34d399; box-shadow: 0 0 10px rgba(52, 211, 153, 0.8); flex-shrink: 0; }
.device-mock-row { display: flex; align-items: center; height: 34px; padding: 0 12px; margin-bottom: 8px; border-radius: 8px; background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.05); }
.device-mock-row.active { background: linear-gradient(90deg, rgba(var(--accent-rgb), 0.16) 0%, rgba(var(--accent2-rgb), 0.1) 100%); border-color: rgba(var(--accent-rgb), 0.35); }
.device-mock-row .row-bar { display: block; height: 6px; border-radius: 999px; background: rgba(255, 255, 255, 0.14); }
.device-mock-row.active .row-bar { background: linear-gradient(90deg, var(--accent) 0%, var(--accent3) 100%); }

.floating-chip { position: absolute; padding: 10px 16px; font-size: 12.5px; font-weight: 700; color: var(--ink); display: flex; align-items: center; gap: 8px; box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35); }
.chip-1 { top: 6%; right: -6%; }
.chip-2 { bottom: 10%; left: -8%; }
.visual-caption { margin-top: 22px; font-size: 11.5px; color: var(--ink-dim); text-align: center; }

/* stat strip */
.stat-strip { position: relative; display: flex; flex-wrap: wrap; border-top: 1px solid var(--border); }
.stat-strip .stat { flex: 1; min-width: 170px; padding: 24px; border-right: 1px solid var(--border); }
.stat-strip .stat:last-child { border-right: none; }
.stat-strip .stat .num { font-size: 27px; font-weight: 800; display: block; margin-bottom: 2px; background: linear-gradient(135deg, var(--accent3) 0%, var(--accent) 100%); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat-strip .stat .label { font-size: 12.5px; color: var(--ink-dim); }

/* ============ SECTION RHYTHM ============ */
.section { max-width: 1140px; margin: 0 auto; padding: 76px 24px; border-top: 1px solid var(--border); }
.section:first-of-type { border-top: none; }
.section-narrow { max-width: 780px; }
.section-head { max-width: 640px; margin: 0 0 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow { display: block; font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent3); font-weight: 700; margin-bottom: 12px; }
.section-head h2 { margin: 0 0 12px; color: var(--ink); }
.section-head p { color: var(--ink-soft); margin: 0; font-size: 15.5px; }

/* feature / overview cards */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s; }
.feature-card:hover { border-color: rgba(var(--accent-rgb), 0.45); transform: translateY(-3px); box-shadow: 0 16px 40px rgba(var(--accent-rgb), 0.14); }
.feature-icon { width: 44px; height: 44px; border-radius: 11px; background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.22) 0%, rgba(var(--accent2-rgb), 0.18) 100%); border: 1px solid rgba(var(--accent-rgb), 0.3); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 17px; margin-bottom: 18px; font-weight: 700; }
.feature-card h3 { margin: 0 0 8px; font-size: 16.5px; color: var(--ink); }
.feature-card p { font-size: 14px; color: var(--ink-soft); margin: 0; }

/* overview cards (variant, same visual language) */
.overview-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.overview-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 20px; }
.overview-card .ov-icon { width: 38px; height: 38px; border-radius: 10px; background: rgba(var(--accent3-rgb), 0.14); border: 1px solid rgba(var(--accent3-rgb), 0.3); color: var(--accent3); display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 14px; }
.overview-card h3 { margin: 0 0 6px; font-size: 15px; color: var(--ink); }
.overview-card p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }

/* client / device showcase */
.client-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.client-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 20px; text-align: center; transition: border-color 0.2s, transform 0.2s; }
.client-card:hover { border-color: rgba(var(--accent3-rgb), 0.4); transform: translateY(-3px); }
.client-frame { width: 56px; height: 56px; margin: 0 auto 16px; border-radius: 14px; background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.2) 0%, rgba(var(--accent3-rgb), 0.16) 100%); border: 1px solid rgba(255, 255, 255, 0.12); display: flex; align-items: center; justify-content: center; font-size: 22px; }
.client-card h3 { margin: 0 0 8px; font-size: 15px; color: var(--ink); }
.client-card p { font-size: 12.5px; color: var(--ink-dim); margin: 0; }

/* scenario cards */
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scenario-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.scenario-icon { display: inline-flex; width: 40px; height: 40px; border-radius: 10px; background: rgba(255, 255, 255, 0.05); align-items: center; justify-content: center; font-size: 19px; margin-bottom: 14px; }
.scenario-card h3 { margin: 0 0 6px; font-size: 15.5px; color: var(--ink); }
.scenario-card p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }

/* how it works — horizontal stepper */
.stepper { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.stepper::before { content: ""; position: absolute; top: 22px; left: 8%; right: 8%; height: 1px; background: linear-gradient(90deg, rgba(var(--accent-rgb), 0.5), rgba(var(--accent3-rgb), 0.5)); z-index: 0; }
.stepper-item { position: relative; z-index: 1; padding: 0 14px; text-align: left; }
.stepper-item .step-num { width: 44px; height: 44px; border-radius: 50%; background: var(--bg); border: 1.5px solid rgba(var(--accent-rgb), 0.5); color: var(--ink); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 15px; margin-bottom: 18px; box-shadow: 0 0 20px rgba(var(--accent-rgb), 0.25); }
.stepper-item h3 { margin: 0 0 6px; font-size: 15.5px; color: var(--ink); }
.stepper-item p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }

/* legacy: steps-flow (still used by /getting-started/) */
.steps-flow { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.steps-flow li { position: relative; padding: 0 0 34px 58px; }
.steps-flow li:last-child { padding-bottom: 0; }
.steps-flow li::before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: -4px; width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; }
.steps-flow li:not(:last-child)::after { content: ""; position: absolute; left: 19px; top: 40px; bottom: 6px; width: 1.5px; background: var(--border); }
.steps-flow h3 { margin: 6px 0 6px; color: var(--ink); }
.steps-flow p { margin: 0; font-size: 14.5px; color: var(--ink-soft); }

/* FAQ accordion */
.faq-list { max-width: 780px; }
.faq-item { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 18px 22px; margin-bottom: 10px; }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 15.5px; color: var(--ink); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; color: var(--ink-dim); font-size: 18px; }
.faq-item[open] summary::after { content: "–"; }
.faq-a { margin-top: 12px; color: var(--ink-soft); font-size: 14.5px; }

.callout { background: var(--glass); border: 1px solid var(--border); border-left: 3px solid var(--accent); padding: 16px 20px; margin: 24px 0; font-size: 14.5px; color: var(--ink-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }

.inline-cta { margin: 30px 0; padding: 26px; background: var(--glass); border: 1px solid var(--border); text-align: center; border-radius: var(--radius); }
.inline-cta p { margin-bottom: 14px; color: var(--ink); font-weight: 600; }

/* legacy editorial blocks retained for other homes pages */
.reasons-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 24px 0 10px; }
.reason-card { border-left: 2px solid var(--accent); padding-left: 16px; }
.reason-card h3 { margin-top: 0; color: var(--ink); }

table.client-table { width: 100%; border-collapse: collapse; margin: 10px 0 24px; font-size: 14.5px; }
table.client-table th, table.client-table td { text-align: left; padding: 10px 6px; border-bottom: 1px solid var(--border); color: var(--ink-soft); }
table.client-table th { color: var(--ink-dim); font-weight: 600; font-size: 13px; }

.decision-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.decision-card { padding: 26px; border-radius: var(--radius); background: var(--glass); border: 1px solid var(--border); border-top: 3px solid var(--accent); }
.decision-card h3 { margin: 0 0 8px; font-size: 16px; color: var(--ink); }
.decision-card p { font-size: 14px; color: var(--ink-soft); margin: 0; }

.quicklinks-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.quicklink-card { display: block; background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; color: var(--ink); transition: border-color 0.15s; }
.quicklink-card:hover { border-color: rgba(var(--accent-rgb), 0.4); text-decoration: none; }
.quicklink-card .ql-title { font-weight: 700; font-size: 14.5px; display: block; margin-bottom: 6px; color: var(--ink); }
.quicklink-card .ql-desc { font-size: 12.5px; color: var(--ink-dim); display: block; margin-bottom: 10px; }
.quicklink-card .ql-arrow { color: var(--accent3); font-size: 13px; font-weight: 700; }

/* CTA banner */
.cta-banner { position: relative; overflow: hidden; max-width: 1140px; margin: 0 auto; padding: 64px 44px; border-radius: 24px; background: linear-gradient(135deg, #141a2e 0%, #1c1638 100%); border: 1px solid var(--border-strong); text-align: center; }
.cta-banner::before { content: ""; position: absolute; top: -140px; left: 50%; transform: translateX(-50%); width: 520px; height: 520px; border-radius: 50%; background: radial-gradient(circle, rgba(var(--accent-rgb), 0.35) 0%, rgba(var(--accent-rgb), 0) 70%); pointer-events: none; }
.cta-banner h2 { position: relative; color: #fff; margin: 0 0 12px; font-size: 30px; }
.cta-banner p { position: relative; color: var(--ink-soft); margin: 0 0 28px; font-size: 15.5px; }
.cta-banner .btn-cta { position: relative; }

/* footer */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); margin-top: 0; }
.footer-inner { max-width: 1140px; margin: 0 auto; padding: 48px 24px; display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 28px; }
.footer-col h4 { font-size: 12.5px; letter-spacing: 1px; color: var(--ink-dim); margin: 0 0 14px; text-transform: uppercase; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 9px; font-size: 13.5px; }
.footer-col a { color: var(--ink-soft); }
.footer-logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 16px; margin-bottom: 12px; color: var(--ink); }
.footer-brand p { font-size: 13.5px; margin-bottom: 18px; }
.footer-bottom { border-top: 1px solid var(--border); padding: 18px 24px 32px; max-width: 1140px; margin: 0 auto; font-size: 11.5px; color: var(--ink-dim); }
.footer-disclosure { max-width: 900px; }
.footer-friends { font-size: 11.5px; color: var(--ink-dim); margin: 10px 0; }
.footer-friends a { color: var(--ink-soft); }

@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { margin-top: 20px; }
  .feature-grid, .overview-grid, .client-grid, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .stepper { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .stepper::before { display: none; }
  .quicklinks-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .nav-wrap {
    position: absolute; top: 100%; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: flex-start; padding: 10px 24px 18px; gap: 12px; display: none;
  }
  .nav-wrap.is-open { display: flex; }
  .site-nav { flex-direction: column; gap: 14px; }
  .footer-inner { grid-template-columns: 1fr; }
  h1 { font-size: 27px; }
  .hero h1 { font-size: 32px; }
  .hero-inner { padding: 44px 20px 30px; }
  .feature-grid, .scenario-grid, .overview-grid, .client-grid, .decision-grid, .quicklinks-grid { grid-template-columns: 1fr; }
  .stepper { grid-template-columns: 1fr; }
  .section { padding: 48px 20px; }
  .cta-banner { padding: 40px 24px; margin: 0 16px; border-radius: 18px; }
  .cta-banner h2 { font-size: 23px; }
  .chip-1, .chip-2 { position: static; margin: 10px auto 0; width: fit-content; }
}