/* QooApp 官网样式 — 原型 B 社区编辑型
   白灰底 + 黑字 + #08bfd7 强调色 + 实线边框 + 4-10px 圆角 + 轻量阴影 */

:root {
  --qoo-ink: #0f1b2a;
  --qoo-ink-2: #3d4a5c;
  --qoo-ink-3: #6b7686;
  --qoo-line: #dfe5ec;
  --qoo-line-2: #eef2f6;
  --qoo-bg: #f6f8fb;
  --qoo-card: #ffffff;
  --qoo-accent: #08bfd7;
  --qoo-accent-deep: #0696ad;
  --qoo-accent-soft: #e6f9fc;
  --qoo-warn: #f59e0b;
  --qoo-rise: #8b5cf6;
  --qoo-shadow: 0 1px 2px rgba(15, 27, 42, 0.04), 0 4px 12px rgba(15, 27, 42, 0.05);
  --qoo-shadow-hover: 0 2px 6px rgba(15, 27, 42, 0.06), 0 10px 28px rgba(8, 191, 215, 0.12);
  --qoo-radius: 8px;
  --qoo-radius-lg: 14px;
  --qoo-max: 1180px;
  --qoo-font: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--qoo-font);
  color: var(--qoo-ink);
  background: var(--qoo-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--qoo-accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3 { line-height: 1.25; margin: 0; letter-spacing: 0; font-weight: 700; }
p { margin: 0; }

/* ===== Topbar ===== */
.qoo-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--qoo-line);
  backdrop-filter: saturate(140%) blur(6px);
}
.qoo-topbar-inner {
  max-width: var(--qoo-max);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.qoo-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.qoo-brand img { border-radius: 8px; }
.qoo-brand-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--qoo-ink);
}
.qoo-nav {
  display: flex;
  gap: 4px;
  margin-right: auto;
  flex-wrap: wrap;
}
.qoo-nav a {
  padding: 8px 14px;
  font-size: 15px;
  color: var(--qoo-ink-2);
  border-radius: 6px;
  transition: color .15s, background .15s;
}
.qoo-nav a:hover { color: var(--qoo-accent-deep); background: var(--qoo-accent-soft); }

.qoo-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--qoo-radius);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .12s, box-shadow .15s, background .15s;
}
.qoo-btn-accent {
  background: var(--qoo-accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(8, 191, 215, 0.28);
}
.qoo-btn-accent:hover { background: var(--qoo-accent-deep); transform: translateY(-1px); box-shadow: 0 6px 18px rgba(8, 191, 215, 0.38); }
.qoo-btn-lg { padding: 13px 28px; font-size: 17px; }
.qoo-btn-block { display: flex; justify-content: center; width: 100%; }
.qoo-link-btn {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--qoo-ink-2);
  border: 1px solid var(--qoo-line);
  border-radius: var(--qoo-radius);
  background: #fff;
  transition: border-color .15s, color .15s;
}
.qoo-link-btn:hover { border-color: var(--qoo-accent); color: var(--qoo-accent-deep); }

.qoo-menu-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--qoo-line);
  background: #fff;
  border-radius: 8px;
  font-size: 20px;
  color: var(--qoo-ink);
}
.qoo-mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px 20px 16px;
  background: #fff;
  border-bottom: 1px solid var(--qoo-line);
}
.qoo-mobile-menu[hidden] { display: none !important; }
.qoo-mobile-menu a {
  padding: 10px 12px;
  font-size: 15px;
  color: var(--qoo-ink-2);
  border-radius: 6px;
}
.qoo-mobile-menu a:hover { background: var(--qoo-accent-soft); color: var(--qoo-accent-deep); }

/* ===== Masthead / Hero ===== */
.qoo-masthead {
  background:
    radial-gradient(ellipse 900px 480px at 85% -40px, rgba(8, 191, 215, 0.10) 0%, transparent 65%),
    linear-gradient(180deg, #ffffff 0%, var(--qoo-bg) 100%);
  padding: 56px 20px 36px;
  border-bottom: 1px solid var(--qoo-line-2);
}
.qoo-masthead-grid {
  max-width: var(--qoo-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.qoo-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--qoo-accent-deep);
  background: var(--qoo-accent-soft);
  border: 1px solid rgba(8, 191, 215, 0.22);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.qoo-masthead h1 {
  font-size: 56px;
  font-weight: 800;
  color: var(--qoo-ink);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.qoo-masthead-lead {
  font-size: 22px;
  font-weight: 600;
  color: var(--qoo-ink);
  line-height: 1.4;
  margin-bottom: 14px;
}
.qoo-masthead-desc {
  font-size: 16px;
  color: var(--qoo-ink-2);
  max-width: 540px;
  margin-bottom: 24px;
}
.qoo-masthead-cta {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.qoo-masthead-tags {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.qoo-masthead-tags li {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 14px;
  color: var(--qoo-ink-3);
}
.qoo-masthead-tags i { color: var(--qoo-accent); font-size: 16px; }

/* Discovery panel */
.qoo-discovery {
  position: relative;
  margin: 0;
  display: flex;
  justify-content: center;
}
.qoo-discovery > img {
  width: 340px;
  max-width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--qoo-line);
  box-shadow: var(--qoo-shadow-hover);
}
.qoo-discovery-caption {
  position: absolute;
  left: 0; right: 0; bottom: 16px;
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 0 12px;
}
.qoo-chip {
  font-size: 12px;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--qoo-line);
  box-shadow: 0 2px 6px rgba(15, 27, 42, 0.06);
}
.qoo-chip-rank { color: var(--qoo-accent-deep); border-color: rgba(8, 191, 215, 0.35); }
.qoo-chip-new { color: var(--qoo-warn); border-color: rgba(245, 158, 11, 0.35); }
.qoo-chip-rising { color: var(--qoo-rise); border-color: rgba(139, 92, 246, 0.35); }

/* Perks strip */
.qoo-perks {
  max-width: var(--qoo-max);
  margin: 32px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 0;
}
.qoo-perks li {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  align-items: start;
  gap: 4px 10px;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid var(--qoo-line);
  border-radius: var(--qoo-radius);
  font-size: 14px;
  color: var(--qoo-ink-2);
}
.qoo-perks i { color: var(--qoo-accent); font-size: 20px; margin-top: 1px; grid-column: 1; grid-row: 1 / span 2; align-self: start; }
.qoo-perks .perk-label { color: var(--qoo-ink); font-size: 14px; font-weight: 700; grid-column: 2; grid-row: 1; }
.qoo-perks .perk-desc { color: var(--qoo-ink-2); grid-column: 2; grid-row: 2; }

/* ===== Section head ===== */
.qoo-section-head {
  max-width: var(--qoo-max);
  margin: 0 auto 28px;
  padding: 0 4px;
}
.qoo-section-head h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--qoo-ink);
  margin-bottom: 8px;
}
.qoo-section-head p {
  font-size: 16px;
  color: var(--qoo-ink-2);
  max-width: 760px;
}

/* ===== Screens ===== */
.qoo-screens {
  padding: 64px 20px;
  background: var(--qoo-bg);
  border-bottom: 1px solid var(--qoo-line-2);
}
.qoo-screen-track {
  max-width: var(--qoo-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.qoo-screen-track figure {
  margin: 0;
  background: #fff;
  border: 1px solid var(--qoo-line);
  border-radius: var(--qoo-radius-lg);
  padding: 10px;
  box-shadow: var(--qoo-shadow);
  transition: transform .15s, box-shadow .15s;
}
.qoo-screen-track figure:hover { transform: translateY(-3px); box-shadow: var(--qoo-shadow-hover); }
.qoo-screen-track img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--qoo-line-2);
}
.qoo-screen-track figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--qoo-ink-2);
  margin-top: 10px;
  font-weight: 500;
}
.qoo-screen-hint {
  max-width: var(--qoo-max);
  margin: 16px auto 0;
  text-align: center;
  font-size: 13px;
  color: var(--qoo-ink-3);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* ===== Abilities ===== */
.qoo-abilities {
  padding: 64px 20px;
  background: #fff;
  border-bottom: 1px solid var(--qoo-line-2);
}
.qoo-ability-grid {
  max-width: var(--qoo-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.qoo-ability-card {
  background: var(--qoo-bg);
  border: 1px solid var(--qoo-line);
  border-radius: var(--qoo-radius-lg);
  padding: 22px 24px;
  transition: border-color .15s, background .15s, transform .15s;
}
.qoo-ability-card:hover { border-color: var(--qoo-accent); background: var(--qoo-accent-soft); transform: translateY(-2px); }
.qoo-ability-card i {
  font-size: 26px;
  color: var(--qoo-accent);
  display: inline-flex;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  background: #fff;
  border: 1px solid var(--qoo-line);
  border-radius: 10px;
  margin-bottom: 14px;
}
.qoo-ability-card h3 { font-size: 18px; color: var(--qoo-ink); margin-bottom: 8px; }
.qoo-ability-card p { font-size: 14px; color: var(--qoo-ink-2); line-height: 1.65; }

/* ===== FAQ ===== */
.qoo-faq {
  padding: 64px 20px;
  background: var(--qoo-bg);
  border-bottom: 1px solid var(--qoo-line-2);
}
.qoo-faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.qoo-faq-list details {
  background: #fff;
  border: 1px solid var(--qoo-line);
  border-radius: var(--qoo-radius);
  overflow: hidden;
  transition: border-color .15s, box-shadow .15s;
}
.qoo-faq-list details[open] { border-color: var(--qoo-accent); box-shadow: 0 4px 14px rgba(8, 191, 215, 0.08); }
.qoo-faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--qoo-ink);
  cursor: pointer;
  list-style: none;
}
.qoo-faq-list summary::-webkit-details-marker { display: none; }
.qoo-faq-list summary i {
  font-size: 20px;
  color: var(--qoo-accent);
  transition: transform .2s;
  flex-shrink: 0;
}
.qoo-faq-list details[open] summary i { transform: rotate(180deg); }
.qoo-faq-list details p {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--qoo-ink-2);
  line-height: 1.7;
}

/* ===== Voices / Reviews ===== */
.qoo-voices {
  padding: 64px 20px;
  background: #fff;
  border-bottom: 1px solid var(--qoo-line-2);
}
.qoo-voice-grid {
  max-width: var(--qoo-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.qoo-review {
  background: var(--qoo-bg);
  border: 1px solid var(--qoo-line);
  border-radius: var(--qoo-radius-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.qoo-review-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
}
.qoo-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.qoo-ava-1 { background: linear-gradient(135deg, #08bfd7, #0696ad); }
.qoo-ava-2 { background: linear-gradient(135deg, #f59e0b, #ea580c); }
.qoo-ava-3 { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
.qoo-ava-4 { background: linear-gradient(135deg, #ec4899, #be185d); }
.qoo-ava-5 { background: linear-gradient(135deg, #10b981, #047857); }
.qoo-ava-6 { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.qoo-review-name { display: block; font-size: 14px; font-weight: 600; color: var(--qoo-ink); }
.qoo-stars { display: inline-flex; gap: 1px; font-size: 12px; color: #f59e0b; margin-top: 2px; }
.qoo-stars .ri-star-line { color: #d4d8de; }
.qoo-review-head time {
  font-size: 12px;
  color: var(--qoo-ink-3);
  text-align: right;
  align-self: flex-start;
  padding-top: 2px;
}
.qoo-review p { font-size: 14px; color: var(--qoo-ink-2); line-height: 1.7; }

/* ===== Final CTA ===== */
.qoo-final-cta {
  padding: 72px 20px;
  background:
    radial-gradient(ellipse 700px 320px at 50% 0%, rgba(8, 191, 215, 0.08) 0%, transparent 70%),
    var(--qoo-bg);
  border-bottom: 1px solid var(--qoo-line-2);
}
.qoo-final-inner {
  max-width: 920px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--qoo-line);
  border-radius: 20px;
  padding: 40px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 36px;
  align-items: center;
  box-shadow: var(--qoo-shadow-hover);
}
.qoo-final-copy h2 { font-size: 26px; color: var(--qoo-ink); margin-bottom: 10px; }
.qoo-final-copy p { font-size: 15px; color: var(--qoo-ink-2); margin-bottom: 20px; }
.qoo-final-note {
  font-size: 13px !important;
  color: var(--qoo-ink-3) !important;
  margin-top: 12px !important;
  margin-bottom: 0 !important;
}
.qoo-qr {
  margin: 0;
  text-align: center;
  background: var(--qoo-bg);
  border: 1px solid var(--qoo-line);
  border-radius: 14px;
  padding: 14px;
}
.qoo-qr img {
  width: 168px; height: 168px;
  border-radius: 6px;
}
.qoo-qr figcaption { font-size: 12px; color: var(--qoo-ink-3); margin-top: 8px; }

/* ===== Footer ===== */
.qoo-foot {
  background: #0f1b2a;
  color: #c7d1dc;
  padding: 36px 20px 24px;
}
.qoo-foot-inner {
  max-width: var(--qoo-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.qoo-foot-brand { display: flex; align-items: center; gap: 12px; }
.qoo-foot-brand img { background: #fff; border-radius: 6px; }
.qoo-foot-brand b { display: block; color: #fff; font-size: 17px; }
.qoo-foot-brand span { display: block; font-size: 13px; color: #8a98a8; }
.qoo-foot-nav {
  display: flex;
  gap: 4px;
  margin: 0 auto 0 24px;
  flex-wrap: wrap;
}
.qoo-foot-nav a { padding: 6px 12px; font-size: 14px; color: #c7d1dc; border-radius: 6px; }
.qoo-foot-nav a:hover { color: var(--qoo-accent); background: rgba(255,255,255,0.04); }
.qoo-foot .qoo-btn-accent { background: var(--qoo-accent); }
.qoo-foot-copy {
  max-width: var(--qoo-max);
  margin: 20px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 13px;
  color: #6f7d8d;
  text-align: center;
}

/* ===== Back to top ===== */
.qoo-back-top {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--qoo-line);
  background: #fff;
  color: var(--qoo-accent-deep);
  font-size: 22px;
  display: none;
  align-items: center; justify-content: center;
  box-shadow: var(--qoo-shadow-hover);
  z-index: 40;
  transition: transform .15s, opacity .2s;
}
.qoo-back-top.is-visible { display: inline-flex; }
.qoo-back-top:hover { transform: translateY(-2px); }

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .qoo-masthead-grid { grid-template-columns: 1fr; gap: 32px; }
  .qoo-discovery > img { width: 280px; }
  .qoo-discovery { justify-content: flex-start; }
  .qoo-perks { grid-template-columns: repeat(2, 1fr); }
  .qoo-screen-track { grid-template-columns: repeat(2, 1fr); }
  .qoo-ability-grid { grid-template-columns: repeat(2, 1fr); }
  .qoo-voice-grid { grid-template-columns: repeat(2, 1fr); }
  .qoo-final-inner { grid-template-columns: 1fr; padding: 32px 28px; text-align: center; }
  .qoo-qr { justify-self: center; }
  .qoo-foot-nav { margin-left: 0; }
}

@media (max-width: 760px) {
  .qoo-nav { display: none; }
  .qoo-topbar .qoo-btn-accent { display: none; }
  .qoo-menu-toggle { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; }
  body.menu-open .qoo-mobile-menu { display: flex; }
  .qoo-masthead { padding: 40px 16px 28px; }
  .qoo-masthead h1 { font-size: 36px; }
  .qoo-masthead-lead { font-size: 18px; }
  .qoo-masthead-desc { font-size: 15px; }
  .qoo-masthead-cta { flex-direction: column; align-items: stretch; }
  .qoo-masthead-cta .qoo-btn,
  .qoo-masthead-cta .qoo-link-btn { width: 100%; justify-content: center; }
  .qoo-discovery > img { width: 240px; }
  .qoo-perks { grid-template-columns: 1fr; margin-top: 24px; }
  .qoo-section-head h2 { font-size: 22px; }
  .qoo-section-head p { font-size: 14px; }
  .qoo-screens, .qoo-abilities, .qoo-faq, .qoo-voices, .qoo-final-cta { padding: 44px 16px; }
  .qoo-screen-track { grid-template-columns: 1fr; }
  .qoo-ability-grid { grid-template-columns: 1fr; }
  .qoo-voice-grid { grid-template-columns: 1fr; }
  .qoo-final-inner { padding: 24px 20px; }
  .qoo-final-copy h2 { font-size: 22px; }
  .qoo-qr { padding: 10px; }
  .qoo-qr img { width: 140px; height: 140px; }
  .qoo-foot-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .qoo-foot-nav { margin: 0; }
  .qoo-back-top { right: 16px; bottom: 16px; }
}

@media (max-width: 460px) {
  .qoo-masthead h1 { font-size: 32px; }
}

/* Print-safe: no fixed backdrop-filter issues */
@media print {
  .qoo-topbar, .qoo-back-top { display: none; }
}