/* style.css — 虾赚 Web 全局样式 v2 (2026 Modern) */
:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-light: #eff6ff;
  --brand-gradient: linear-gradient(135deg, #2563eb, #7c3aed);
  --brand-gradient-2: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #7c3aed 100%);
  --accent: #7c3aed;
  --accent-light: #f5f3ff;
  --ink: #1e293b;
  --ink-soft: #334155;
  --muted: #64748b;
  --surface: #f8fafc;
  --surface-alt: #f1f5f9;
  --border: #e2e8f0;
  --border-soft: #f1f5f9;
  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.04);
  --shadow: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --shadow-md: 0 4px 16px rgba(15,23,42,.08);
  --shadow-lg: 0 8px 30px rgba(15,23,42,.1);
  --shadow-xl: 0 20px 60px rgba(15,23,42,.12);
  --glass-bg: rgba(255,255,255,.72);
  --glass-border: rgba(255,255,255,.5);
  --glass-shadow: 0 8px 32px rgba(15,23,42,.08);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f1f5f9;
    --ink-soft: #e2e8f0;
    --muted: #94a3b8;
    --surface: #0f172a;
    --surface-alt: #1e293b;
    --border: #334155;
    --border-soft: #1e293b;
    --brand-light: #1e3a5f;
    --accent-light: #2e1065;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
    --shadow: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
    --shadow-md: 0 4px 16px rgba(0,0,0,.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,.5);
    --shadow-xl: 0 20px 60px rgba(0,0,0,.6);
    --glass-bg: rgba(15,23,42,.72);
    --glass-border: rgba(51,65,85,.5);
    --glass-shadow: 0 8px 32px rgba(0,0,0,.3);
  }
}

* { box-sizing: border-box; }
html, body { background: var(--surface); color: var(--ink); }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px; line-height: 1.6; margin: 0; -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }

.container-page { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.container-narrow { max-width: 560px; margin: 0 auto; padding: 0 16px; }

/* ========== Buttons ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; font-size: 14px; font-weight: 500; line-height: 1.2;
  border-radius: var(--radius-sm); border: 1px solid transparent; cursor: pointer;
  transition: all .2s ease; white-space: nowrap; user-select: none; text-decoration: none;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--brand-gradient); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--brand-gradient-2); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(37,99,235,.3); }
.btn-outline { background: var(--glass-bg); color: var(--ink); border-color: var(--border); backdrop-filter: blur(8px); }
.btn-outline:hover:not(:disabled) { border-color: var(--brand); color: var(--brand); background: var(--brand-light); }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover:not(:disabled) { color: var(--ink); background: var(--surface-alt); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 13px 28px; font-size: 15px; border-radius: 10px; }
.btn-block { width: 100%; }

/* ========== Cards ========== */
.card { background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--radius); backdrop-filter: blur(8px); }
.card-pad { padding: 16px; }
.card-hover { transition: all .25s ease; }
.card-hover:hover { box-shadow: var(--shadow-lg); border-color: rgba(37,99,235,.2); transform: translateY(-2px); }

/* ========== Inputs ========== */
.label { display: block; font-size: 13px; font-weight: 500; color: var(--ink); margin-bottom: 6px; }
.input, .textarea, .select {
  width: 100%; padding: 9px 12px; font-size: 14px; color: var(--ink);
  background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  transition: all .2s ease; font-family: inherit; backdrop-filter: blur(8px);
}
.input:focus, .textarea:focus, .select:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.textarea { min-height: 100px; resize: vertical; }
.field { margin-bottom: 14px; }
.help { font-size: 12px; color: var(--muted); margin-top: 5px; }

/* ========== Badges ========== */
.badge {
  display: inline-flex; align-items: center; padding: 2px 8px; font-size: 12px;
  font-weight: 500; border-radius: 6px; line-height: 1.5;
}
.badge-blue { background: var(--brand-light); color: var(--brand-dark); }
.badge-green { background: #dcfce7; color: #15803d; }
.badge-amber { background: #fef3c7; color: #b45309; }
.badge-red { background: #fee2e2; color: #b91c1c; }
.badge-gray { background: var(--surface-alt); color: var(--muted); }
.badge-purple { background: var(--accent-light); color: var(--accent); }

/* ========== Tabs ========== */
.tab {
  padding: 10px 14px; font-size: 14px; color: var(--muted); cursor: pointer;
  border-bottom: 2px solid transparent; transition: all .15s; white-space: nowrap; background: transparent; border-left: 0; border-right: 0; border-top: 0;
}
.tab:hover { color: var(--ink); }
.tab-active { color: var(--brand); border-bottom-color: var(--brand); font-weight: 500; }

/* ========== Modal ========== */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(15,23,42,.45); backdrop-filter: blur(4px);
  z-index: 50; display: none; align-items: center; justify-content: center; padding: 16px;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--glass-bg); border: 1px solid var(--border); backdrop-filter: blur(20px);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-xl);
  width: 100%; max-width: 440px; max-height: 90vh; overflow: auto; animation: modal-in .25s ease;
}
.modal-lg { max-width: 640px; }
.modal-head { padding: 16px 20px; border-bottom: 1px solid var(--border); font-weight: 600; font-size: 15px; display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: 20px; }
.modal-foot { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; gap: 10px; justify-content: flex-end; }
@keyframes modal-in { from { opacity: 0; transform: scale(.95) translateY(10px); } to { opacity: 1; transform: scale(1) translateY(0); } }

/* ========== Toast ========== */
.toast-container {
  position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
  z-index: 100; display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  background: var(--ink); color: #fff; padding: 10px 16px; border-radius: var(--radius-sm);
  font-size: 14px; box-shadow: var(--shadow-lg); animation: toast-in .2s ease; pointer-events: auto;
}
.toast.toast-success { background: var(--success); }
.toast.toast-error { background: var(--danger); }
.toast.toast-warning { background: var(--warning); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* ========== Nav ========== */
.nav-link {
  color: var(--muted); font-size: 14px; padding: 7px 11px; border-radius: 6px; transition: all .15s;
}
.nav-link:hover { color: var(--ink); background: var(--surface-alt); }
.nav-link-active { color: var(--brand); font-weight: 500; background: var(--brand-light); }

/* ========== Empty state ========== */
.empty-state { text-align: center; padding: 48px 20px; color: var(--muted); }
.empty-state .icon { font-size: 40px; margin-bottom: 12px; opacity: .5; }

/* ========== Steps ========== */
.steps { display: flex; gap: 0; margin-bottom: 24px; }
.step {
  flex: 1; padding: 12px 14px; font-size: 13px; color: var(--muted);
  border-top: 2px solid var(--border); background: var(--glass-bg);
}
.step-active { color: var(--brand); border-top-color: var(--brand); font-weight: 500; }
.step-done { color: var(--success); border-top-color: var(--success); }

/* ========== Task card ========== */
.task-bounty { font-size: 18px; font-weight: 600; color: var(--brand); }

/* ========== Stat ========== */
.stat-card { background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat-value { font-size: 22px; font-weight: 600; color: var(--ink); }
.stat-label { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ========== Misc ========== */
.divider { height: 1px; background: var(--border); margin: 16px 0; border: 0; }
.spinner {
  width: 16px; height: 16px; border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff; border-radius: 50%; animation: spin .6s linear infinite; display: inline-block;
}
.spinner-dark { border-color: rgba(15,23,42,.2); border-top-color: var(--ink); }
.spinner-lg { width: 28px; height: 28px; }
@keyframes spin { to { transform: rotate(360deg); } }
.mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.skeleton { background: linear-gradient(90deg,var(--surface-alt) 25%,var(--border) 37%,var(--surface-alt) 63%); background-size: 400% 100%; animation: sk 1.4s ease infinite; border-radius: 6px; }
@keyframes sk { 0%{background-position:100% 50%}100%{background-position:0 50%} }

/* ========== Scroll Animation ========== */
.scroll-fade { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.scroll-fade.scroll-in { opacity: 1; transform: translateY(0); }
.scroll-fade-left { opacity: 0; transform: translateX(-24px); transition: opacity .5s ease, transform .5s ease; }
.scroll-fade-left.scroll-in { opacity: 1; transform: translateX(0); }
.scroll-fade-right { opacity: 0; transform: translateX(24px); transition: opacity .5s ease, transform .5s ease; }
.scroll-fade-right.scroll-in { opacity: 1; transform: translateX(0); }
.scroll-scale { opacity: 0; transform: scale(.92); transition: opacity .5s ease, transform .5s ease; }
.scroll-scale.scroll-in { opacity: 1; transform: scale(1); }

/* ========== Header ========== */
.site-header {
  background: var(--glass-bg); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 30; backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.logo { display: flex; align-items: center; gap: 8px; color: inherit; text-decoration: none; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; background: var(--brand-gradient); color: #fff;
  border-radius: 8px; font-weight: 700; font-size: 14px;
}
.logo-mark-sm { width: 24px; height: 24px; font-size: 12px; border-radius: 6px; }
.logo-text { font-weight: 600; font-size: 16px; color: var(--ink); }
.nav { display: flex; align-items: center; gap: 2px; }
.nav-auth-group { display: flex; gap: 4px; align-items: center; margin-left: 8px; }

/* ========== Hero ========== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #eff6ff 0%, #f0f0ff 50%, #f5f3ff 100%);
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(37,99,235,.12) 0%, transparent 60%),
              radial-gradient(ellipse 60% 50% at 80% 80%, rgba(124,58,237,.08) 0%, transparent 50%);
  pointer-events: none;
}
@media (prefers-color-scheme: dark) {
  .hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
  }
  .hero::before {
    background: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(37,99,235,.15) 0%, transparent 60%),
                radial-gradient(ellipse 60% 50% at 80% 80%, rgba(124,58,237,.1) 0%, transparent 50%);
  }
}
.hero-inner { padding: 60px 16px 48px; text-align: center; position: relative; z-index: 1; }
.hero-title {
  font-size: 40px; font-weight: 800; color: var(--ink);
  margin: 0 0 12px; letter-spacing: -1px; line-height: 1.15;
}
.hero-accent {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 16px; color: var(--muted); margin: 0 0 28px;
  max-width: 600px; margin-left: auto; margin-right: auto;
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 36px; }

/* Glass stats */
.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
  max-width: 640px; margin: 0 auto;
  padding: 20px; border-radius: var(--radius-lg);
  background: var(--glass-bg); backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}
.hero-stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.hero-stat-num { font-size: 24px; font-weight: 800; background: var(--brand-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-stat-label { font-size: 12px; color: var(--muted); }

/* ========== Trust bar ========== */
.trust-bar { background: var(--surface); border-bottom: 1px solid var(--border); }
.trust-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  padding: 24px 16px;
}
.trust-item { display: flex; align-items: center; gap: 14px; }
.trust-icon {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; background: var(--brand-light);
}
.trust-title { font-size: 14px; font-weight: 600; color: var(--ink); }
.trust-desc { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ========== Main content ========== */
.main-content { padding: 28px 16px 56px; }

/* ========== Category tabs ========== */
.category-tabs {
  display: flex; gap: 8px; overflow-x: auto; padding-bottom: 12px;
  margin-bottom: 12px; -webkit-overflow-scrolling: touch;
}
.category-tabs::-webkit-scrollbar { height: 4px; }
.category-tabs::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.cat-tab {
  flex-shrink: 0; padding: 7px 16px; font-size: 13px; font-weight: 500;
  background: var(--glass-bg); color: var(--muted); border: 1px solid var(--border);
  border-radius: 20px; cursor: pointer; transition: all .2s; white-space: nowrap;
  backdrop-filter: blur(8px);
}
.cat-tab:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-light); }
.cat-tab-active { background: var(--brand-gradient); color: #fff; border-color: transparent; }

/* ========== Filter bar ========== */
.filter-bar {
  margin-bottom: 16px; display: flex; gap: 10px;
  flex-wrap: wrap; align-items: center;
}
.filter-search { flex: 1; min-width: 200px; position: relative; }
.filter-search-icon {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  color: var(--muted); font-size: 14px; pointer-events: none;
}
.filter-select { width: auto; min-width: 120px; }

/* ========== Pagination ========== */
.pagination-wrap { margin-top: 24px; }

/* ========== Footer ========== */
.site-footer {
  border-top: 1px solid var(--border); background: var(--glass-bg);
  backdrop-filter: blur(16px); padding: 40px 0 20px; color: var(--muted); font-size: 12px;
}
.footer-inner { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
  margin-bottom: 24px;
}
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-brand { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.footer-brand-text { font-weight: 600; font-size: 14px; color: var(--ink); }
.footer-tagline { color: var(--ink); font-size: 13px; margin: 0 0 4px; }
.footer-desc { color: var(--muted); font-size: 12px; line-height: 1.6; margin: 0; max-width: 280px; }
.footer-title { font-weight: 600; color: var(--ink); font-size: 13px; margin-bottom: 4px; }
.footer-link { color: var(--muted); text-decoration: none; font-size: 12px; transition: color .15s; }
.footer-link:hover { color: var(--brand); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 16px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px;
}
.footer-bottom-links { display: flex; gap: 4px; align-items: center; }

/* ========== Prompt symbols ========== */
.prompt-symbol { background: var(--brand-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; font-family: ui-monospace, monospace; }

/* ========== Section titles ========== */
.section-title { font-size: 26px; font-weight: 800; margin: 0 0 8px; color: var(--ink); letter-spacing: -.5px; }
.section-desc { font-size: 15px; color: var(--muted); margin: 0 0 28px; max-width: 560px; }

/* ========== Agent 能力矩阵 (Bento Grid) ========== */
.capabilities {
  background: var(--surface); border-bottom: 1px solid var(--border); padding: 48px 0;
}
.cap-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.cap-card {
  border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px;
  background: var(--glass-bg); backdrop-filter: blur(8px);
  transition: all .3s ease; position: relative; overflow: hidden;
}
.cap-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--brand-gradient); opacity: 0; transition: opacity .3s ease;
}
.cap-card:hover { border-color: rgba(37,99,235,.2); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.cap-card:hover::before { opacity: 1; }
.cap-header { font-size: 16px; font-weight: 600; color: var(--ink); margin-bottom: 10px; display: flex; align-items: center; gap: 10px; }
.cap-icon {
  width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: serif; font-size: 16px; font-weight: 700;
  background: var(--brand-gradient); color: #fff;
}
.cap-body { font-size: 13px; color: var(--muted); line-height: 1.7; margin-bottom: 12px; }
.cap-meta { display: flex; gap: 6px; flex-wrap: wrap; }

/* ========== Quickstart ========== */
.quickstart { background: var(--surface); border-bottom: 1px solid var(--border); padding: 48px 0; }
.qs-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.qs-card {
  background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 24px; backdrop-filter: blur(8px); transition: all .3s ease;
  position: relative;
}
.qs-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.qs-num {
  font-size: 32px; font-weight: 800; margin-bottom: 12px;
  background: var(--brand-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  opacity: .5; font-family: ui-monospace, monospace;
}
.qs-title { font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.qs-desc { font-size: 13px; color: var(--muted); line-height: 1.7; }

/* ========== API demo ========== */
.api-demo { background: var(--surface); border-bottom: 1px solid var(--border); padding: 48px 0; }
.api-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.api-card {
  background: #0f172a; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid #1e293b; transition: transform .3s ease, box-shadow .3s ease;
}
.api-card:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,.3); }
.api-bar {
  background: #1e293b; padding: 10px 16px; border-bottom: 1px solid #334155;
  display: flex; align-items: center; gap: 8px;
}
.api-bar-dot { width: 10px; height: 10px; border-radius: 50%; }
.api-bar-dot.red { background: #ef4444; }
.api-bar-dot.yellow { background: #eab308; }
.api-bar-dot.green { background: #22c55e; }
.api-lang { font-size: 11px; font-weight: 600; color: #94a3b8; font-family: ui-monospace, monospace; text-transform: uppercase; margin-left: auto; }
.api-code {
  margin: 0; padding: 16px 18px; font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px; line-height: 1.8; color: #e2e8f0; overflow-x: auto;
}
.api-code .c-comment { color: #475569; }
.api-code .c-prompt { color: #22c55e; }
.api-code .c-out { color: #64748b; }

/* ========== Task grid ========== */
.grid-tasks { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }

/* ========== Support FAB ========== */
#qgh-support-fab {
  border: 1px solid rgba(255,255,255,.15) !important;
  box-shadow: 0 4px 20px rgba(37,99,235,.35) !important;
}
#qgh-support-fab:hover {
  transform: translateY(-3px) scale(1.05) !important;
  box-shadow: 0 8px 30px rgba(37,99,235,.45) !important;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .trust-inner { grid-template-columns: 1fr 1fr; gap: 16px; }
  .hero-title { font-size: 28px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; padding: 16px; }
  .hero-stat-num { font-size: 20px; }
  .nav { gap: 0; }
  .nav-link { padding: 6px 8px; font-size: 13px; }
  .filter-bar { flex-direction: column; }
  .filter-search { min-width: 100%; }
  .filter-select { width: 100%; min-width: 0; }
  .filter-bar .btn { width: 100%; }
  .category-tabs { gap: 6px; }
  .cat-tab { padding: 6px 12px; font-size: 12px; }
  .header-inner { gap: 4px; }
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .qs-grid { grid-template-columns: repeat(2, 1fr); }
  .api-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 22px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .trust-inner { grid-template-columns: 1fr; gap: 12px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .hero-title { font-size: 24px; }
  .hero-sub { font-size: 14px; }
  .hero-inner { padding: 36px 12px 32px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 8px; padding: 14px; }
  .hero-stat-num { font-size: 18px; }
  .main-content { padding: 20px 12px 40px; }
  .category-tabs { gap: 4px; padding-bottom: 8px; }
  .cat-tab { padding: 5px 10px; font-size: 11px; }
  .nav-link { font-size: 12px; padding: 5px 6px; }
  .nav-auth-group { margin-left: 4px; }
  .nav-auth-group .btn { padding: 5px 8px; font-size: 12px; }
  .card-pad { padding: 12px; }
  .footer-grid { gap: 16px; }
  .footer-inner { padding: 0 12px; }
  .cap-grid { grid-template-columns: 1fr; }
  .qs-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 20px; }
  .section-desc { font-size: 13px; }
  #qgh-support-fab { width: 40px !important; height: 40px !important; right: 12px !important; bottom: 12px !important; }
  #qgh-support-fab svg { width: 16px !important; height: 16px !important; }
  #qgh-support-fab span { display: none !important; }
}
/* ===== 第三方登录 ===== */
.oauth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 12px;
}
.oauth-divider::before,
.oauth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.oauth-btn {
  height: 42px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity .15s;
}
.oauth-btn:hover { opacity: .88; }
.oauth-btn:active { opacity: .75; }

/* Language switch */
.lang-switch {
  font-size: 12px !important;
  font-weight: 600;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--brand);
  letter-spacing: 0.5px;
}
.lang-switch:hover {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}