/* ===========================================================================
   Luchentech Support — 站点样式
   无第三方依赖，单文件；主题色由每页内联的 --accent 决定。
   =========================================================================== */

:root {
  --accent: #ff5e3a;
  --bg: #ffffff;
  --bg-soft: #f6f9fd;
  --surface: #ffffff;
  --surface-2: #f8fbff;
  --text: #0f1b2a;
  --muted: #5c7288;
  --faint: #8ba0b5;
  --border: #e4ecf6;
  --border-strong: #d3e0ee;
  --shadow: 0 1px 2px rgba(15, 27, 42, .04), 0 8px 24px -14px rgba(15, 27, 42, .16);
  --shadow-lg: 0 2px 4px rgba(15, 27, 42, .04), 0 20px 48px -22px rgba(15, 27, 42, .24);
  --radius: 16px;
  --radius-lg: 22px;
  --ring: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);
  --maxw: 940px;
}

html[data-theme='dark'] {
  --bg: #0c1219;
  --bg-soft: #101821;
  --surface: #131d27;
  --surface-2: #17222e;
  --text: #e9f1f8;
  --muted: #9cb0c4;
  --faint: #7189a0;
  --border: #22303e;
  --border-strong: #2c3d4e;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px -18px rgba(0, 0, 0, .7);
  --shadow-lg: 0 2px 6px rgba(0, 0, 0, .45), 0 24px 60px -26px rgba(0, 0, 0, .8);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme='light']) {
    --bg: #0c1219;
    --bg-soft: #101821;
    --surface: #131d27;
    --surface-2: #17222e;
    --text: #e9f1f8;
    --muted: #9cb0c4;
    --faint: #7189a0;
    --border: #22303e;
    --border-strong: #2c3d4e;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px -18px rgba(0, 0, 0, .7);
    --shadow-lg: 0 2px 6px rgba(0, 0, 0, .45), 0 24px 60px -26px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial,
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible { outline: none; box-shadow: var(--ring); border-radius: 8px; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .88em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: .1em .38em;
  border-radius: 6px;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--surface);
  padding: 10px 16px; border-radius: 0 0 10px 0; z-index: 100;
}
.skip:focus { left: 0; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: -.2px; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 22px; height: 22px; border-radius: 7px;
  background: linear-gradient(140deg, color-mix(in srgb, var(--accent) 60%, #ffd0c0), var(--accent));
  box-shadow: 0 3px 10px -3px color-mix(in srgb, var(--accent) 70%, transparent);
}
.topnav { display: flex; align-items: center; gap: 20px; font-size: 15px; }
.topnav a { color: var(--muted); font-weight: 600; }
.topnav a:hover { color: var(--text); text-decoration: none; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  font-size: 15px; line-height: 1;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
html[data-theme='dark'] .i-sun, html:not([data-theme='light']) .i-sun { display: none; }
html[data-theme='light'] .i-moon { display: none; }
@media (prefers-color-scheme: dark) { html:not([data-theme='light']) .i-moon { display: none; } }
@media (prefers-color-scheme: light) { html[data-theme='dark'] .i-sun { display: none; } }
html[data-theme='dark'] .i-moon { display: inline; }
html[data-theme='light'] .i-sun { display: inline; }

/* ---------------- 通用块 ---------------- */
.hero, .app-hero, .doc-hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(720px 340px at 12% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-bottom: 1px solid var(--border);
}
.doc-hero { padding: 56px 0 44px; }
.eyebrow {
  margin: 0 0 10px; font-size: 13px; font-weight: 800; letter-spacing: 1.6px;
  text-transform: uppercase; color: var(--accent);
}
.hero h1, .app-hero h1, .doc-hero h1 {
  margin: 0; font-size: clamp(30px, 4.4vw, 46px); line-height: 1.12;
  letter-spacing: -1.1px; font-weight: 800;
}
.app-hero h1, .doc-hero h1 { font-size: clamp(28px, 3.6vw, 38px); }
.lead { margin: 16px 0 0; font-size: 19px; color: var(--muted); max-width: 61ch; }
.summary {
  margin: 18px 0 0; padding: 16px 18px; max-width: 70ch;
  background: var(--surface); border: 1px solid var(--border);
  border-left: 4px solid var(--accent); border-radius: 14px; box-shadow: var(--shadow);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border-radius: 999px; font-size: 16px; font-weight: 700;
  border: 1px solid transparent; cursor: pointer; transition: transform .06s ease, box-shadow .16s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 10px 24px -12px color-mix(in srgb, var(--accent) 85%, transparent);
}
.btn-primary:hover { box-shadow: 0 14px 30px -12px color-mix(in srgb, var(--accent) 90%, transparent); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }

.block { padding: 56px 24px; max-width: var(--maxw); margin: 0 auto; }
.block-title { margin: 0 0 6px; font-size: 24px; font-weight: 800; letter-spacing: -.5px; }
.block-lead { margin: 0 0 24px; color: var(--muted); }
.block-head { display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-end; justify-content: space-between; margin-bottom: 22px; }
.block-head .block-lead { margin-bottom: 0; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow);
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; }
.chip {
  font-size: 12.5px; font-weight: 700; color: color-mix(in srgb, var(--accent) 78%, var(--text));
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  padding: 4px 11px; border-radius: 999px;
}
.chip-quiet { color: var(--muted); background: var(--surface-2); border-color: var(--border); }

/* ---------------- 首页 App 列表 ---------------- */
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; }
.app-card {
  display: flex; align-items: center; gap: 18px; padding: 20px;
  color: inherit; transition: transform .14s ease, box-shadow .18s ease, border-color .18s ease;
}
.app-card:hover {
  text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--card-accent, var(--accent)) 40%, var(--border));
}
.app-icon { border-radius: 20px; box-shadow: 0 8px 20px -10px rgba(15, 27, 42, .45); flex: none; }
.app-icon.lg { border-radius: 26px; }
.app-card-body { flex: 1; min-width: 0; }
.app-card-body h3 { margin: 0; font-size: 18px; font-weight: 800; letter-spacing: -.3px; }
.app-card-body p { margin: 5px 0 0; color: var(--muted); font-size: 15px; }
.app-card-arrow { color: var(--faint); font-size: 20px; }
.app-head { display: flex; align-items: center; gap: 22px; margin-top: 18px; }
.app-head .lead { margin-top: 8px; }
.crumb { font-size: 14px; color: var(--faint); }
.crumb a { color: var(--muted); font-weight: 600; }

.policy-links { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.policy-card h3 { margin: 0 0 6px; font-size: 17px; }
.policy-card p { margin: 0; font-size: 15px; }

/* ---------------- FAQ ---------------- */
.search { min-width: 260px; flex: 1; max-width: 340px; }
.search input {
  width: 100%; padding: 12px 16px; font-size: 15px; font-family: inherit;
  color: var(--text); background: var(--surface);
  border: 1px solid var(--border-strong); border-radius: 12px;
}
.search input::placeholder { color: var(--faint); }
.search-status { margin: 7px 2px 0; font-size: 13px; color: var(--faint); }
.faq-group { margin-bottom: 34px; }
.faq-group-title {
  margin: 0 0 12px; font-size: 13px; font-weight: 800; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--faint);
}
.faq-list { display: grid; gap: 10px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
.faq-item[open] { border-color: color-mix(in srgb, var(--accent) 34%, var(--border)); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 17px 20px; cursor: pointer; font-weight: 700; letter-spacing: -.2px;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--accent); }
.chev { flex: none; color: var(--faint); transition: transform .18s ease; }
.faq-item[open] .chev { transform: rotate(180deg); color: var(--accent); }
.faq-body { padding: 0 20px 18px; color: var(--muted); }
.faq-body p { margin: 0; }
.faq-body strong { color: var(--text); }
.faq-item mark { background: color-mix(in srgb, var(--accent) 26%, transparent); color: inherit; border-radius: 3px; padding: 0 2px; }
.empty-note { color: var(--muted); padding: 18px 0; }

/* ---------------- 故障排查 ---------------- */
.ts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.ts-card h3 { margin: 0 0 12px; font-size: 17px; font-weight: 800; letter-spacing: -.3px; }
.ts-steps { margin: 0; padding-left: 20px; color: var(--muted); font-size: 15.5px; }
.ts-steps li { margin-bottom: 7px; }
.ts-steps li::marker { color: var(--accent); font-weight: 700; }

/* ---------------- 联系 ---------------- */
.contact-card { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; justify-content: space-between; }
.contact-copy { flex: 1; min-width: 260px; }
.contact-copy h3 { margin: 0 0 8px; font-size: 19px; font-weight: 800; letter-spacing: -.3px; }
.contact-copy p { margin: 0; color: var(--muted); font-size: 15.5px; }
.muted { color: var(--faint); }

.split { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.split h3 { margin: 0 0 12px; font-size: 17px; }
.link-list { margin: 0; padding-left: 20px; color: var(--muted); }
.link-list li { margin-bottom: 6px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; margin: 0; font-size: 15px; }
.kv dt { color: var(--faint); }
.kv dd { margin: 0; }

/* ---------------- 政策文档 ---------------- */
.doc { padding: 44px 24px 8px; max-width: 74ch; margin: 0 auto; }
.doc section { margin-bottom: 34px; }
.doc h2 { margin: 0 0 12px; font-size: 21px; font-weight: 800; letter-spacing: -.4px; }
.doc p { margin: 0 0 13px; color: var(--muted); }
.back { max-width: 74ch; margin: 0 auto; padding: 8px 24px 72px; font-weight: 600; }

/* ---------------- 页脚 ---------------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 40px 0 56px; margin-top: 40px; }
.footer .wrap { text-align: center; }
.footer-brand { margin: 0 0 8px; font-weight: 800; letter-spacing: -.3px; }
.footer-links { margin: 0 0 14px; color: var(--faint); font-size: 15px; display: flex; gap: 10px; justify-content: center; }
.footer-links a { color: var(--muted); font-weight: 600; }
.footer-note { margin: 0; font-size: 13.5px; color: var(--faint); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero, .app-hero, .doc-hero { padding: 48px 0 40px; }
  .block { padding: 40px 20px; }
  .app-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .contact-card { flex-direction: column; align-items: flex-start; }
  .search { max-width: none; }
}

@media print {
  .topbar, .footer, .hero-actions, .search, .back { display: none; }
  body { font-size: 12pt; }
  .doc p { color: #000; }
}