:root {
  --brand: #0ea5e9;
  --brand-dark: #0284c7;
  --wechat: #07c160;
  --qq: #12b7f5;
  --warn: #f97316;
  --danger: #ef4444;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Inter, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

.container { width: min(1200px, 94%); margin: 0 auto; }

/* Header */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0; gap: 16px;
}
.logo { font-size: 20px; font-weight: 800; color: var(--text); display: flex; align-items: center; gap: 8px; }
.logo span { color: var(--brand); }
.main-nav { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
.main-nav a { color: var(--text); font-weight: 500; }
.main-nav a:hover { color: var(--brand); }
.lang-switch { display: flex; gap: 6px; }
.lang-switch a {
  padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border);
  font-size: 13px; color: var(--muted);
}
.lang-switch a.active { background: var(--brand); color: #fff; border-color: var(--brand); }

/* Footer */
.site-footer { background: #0f172a; color: #cbd5e1; padding: 40px 0 24px; margin-top: 60px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 24px; }
.footer-grid h4 { color: #fff; margin: 0 0 12px; font-size: 15px; }
.footer-grid a { color: #94a3b8; display: block; margin: 6px 0; }
.footer-bottom { text-align: center; margin-top: 24px; padding-top: 24px; border-top: 1px solid #1e293b; font-size: 13px; color: #64748b; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: var(--radius); border: none; cursor: pointer;
  font-size: 14px; font-weight: 600; transition: .15s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-outline { background: #fff; color: var(--brand); border: 1px solid var(--brand); }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* Cards */
.card {
  background: var(--card); border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: var(--shadow); padding: 20px;
}
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }

/* Badges */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge-wechat { background: #dcfce7; color: #15803d; }
.badge-qq { background: #e0f2fe; color: #0369a1; }
.badge-status-open { background: #dcfce7; color: #15803d; }
.badge-status-full { background: #fee2e2; color: #b91c1c; }
.badge-status-expired { background: #ffedd5; color: #c2410c; }
.badge-status-future { background: #fef9c3; color: #a16207; }

/* Hero */
.hero { background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); color: #fff; padding: 56px 0 40px; }
.hero h1 { font-size: 32px; margin: 0 0 16px; }
.hero p { color: #cbd5e1; max-width: 720px; margin: 0 0 24px; }
.search-bar { display: flex; max-width: 640px; gap: 0; }
.search-bar input {
  flex: 1; padding: 14px 18px; border: none; border-radius: var(--radius) 0 0 var(--radius);
  font-size: 15px; outline: none;
}
.search-bar button { border-radius: 0 var(--radius) var(--radius) 0; }

/* Sections */
.section { padding: 40px 0; }
.section-title { font-size: 22px; margin: 0 0 18px; display: flex; align-items: center; justify-content: space-between; }
.section-title a { font-size: 14px; font-weight: 500; }

/* Model chips */
.model-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.model-card { text-align: center; padding: 22px 14px; }
.model-card .icon { font-size: 32px; margin-bottom: 10px; }
.model-card .icon img { margin-bottom: 0; }

/* Model logo / icon (per-model SVG from /logo/{key}.svg, falls back to emoji) */
.model-logo { width: 48px; height: 48px; object-fit: contain; display: inline-block; margin-bottom: 10px; }
.model-icon { font-size: 32px; line-height: 1; display: inline-block; margin-bottom: 10px; }
.model-logo-inline, .model-icon-inline {
  display: inline-block; vertical-align: -5px; width: 26px; height: 26px;
  font-size: 26px; line-height: 1; margin: 0 8px 0 0;
}
.model-card h3 { margin: 0 0 4px; font-size: 17px; }
.model-card p { margin: 0; font-size: 13px; color: var(--muted); }

/* Platform chips */
.platform-grid { display: flex; flex-wrap: wrap; gap: 12px; }
.platform-chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  font-weight: 600; color: var(--text);
}
.platform-chip:hover { border-color: var(--brand); }

/* Post list */
.post-item { display: flex; flex-direction: column; gap: 8px; }
.post-item h3 { margin: 0; font-size: 17px; }
.post-meta { font-size: 13px; color: var(--muted); display: flex; gap: 12px; flex-wrap: wrap; }
.post-item p { margin: 0; color: var(--muted); font-size: 14px; }

/* Filter bar */
.filter-bar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 20px; }
.filter-bar select, .filter-bar input {
  padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border); background: #fff;
}

/* Group cards */
.group-card { display: flex; flex-direction: column; gap: 12px; }
.group-card .head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.group-card h3 { margin: 0; font-size: 18px; }
.group-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.qr-thumb { width: 100%; aspect-ratio: 1; object-fit: contain; background: #f1f5f9; border-radius: 8px; }

/* QR Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgb(0 0 0 / 0.65);
  display: none; align-items: center; justify-content: center; z-index: 100; padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-box { background: #fff; border-radius: var(--radius); max-width: 420px; width: 100%; padding: 24px; position: relative; }
.modal-box img { width: 100%; border-radius: 8px; }
.modal-close { position: absolute; top: 12px; right: 12px; background: #f1f5f9; border: none; border-radius: 50%; width: 32px; height: 32px; cursor: pointer; }

/* Breadcrumb */
.breadcrumb { font-size: 13px; color: var(--muted); padding: 18px 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb span { color: var(--text); }

/* Article */
.article-body { max-width: 760px; }
.article-body h2 { font-size: 22px; margin-top: 32px; }
.article-body p { color: #334155; }

/* Share bar */
.share-bar { display: flex; gap: 10px; flex-wrap: wrap; margin: 24px 0; }

/* FAQ */
.faq dt { font-weight: 700; margin-top: 18px; }
.faq dd { margin: 4px 0 0; color: #334155; }

/* Pagination */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 28px; }
.pagination a, .pagination span { padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border); background: #fff; }
.pagination .current { background: var(--brand); color: #fff; border-color: var(--brand); }

/* Utilities */
.text-center { text-align: center; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 20px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 12px; }

.submit-form label { display: block; margin-bottom: 14px; font-size: 14px; font-weight: 500; }
.submit-form input,
.submit-form select,
.submit-form textarea {
  width: 100%; margin-top: 6px; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 8px; font-size: 15px; font-family: inherit;
}
.submit-form input:focus,
.submit-form select:focus,
.submit-form textarea:focus { outline: none; border-color: var(--brand); }
.submit-form textarea { min-height: 100px; resize: vertical; }
.submit-form .hint { color: var(--muted); font-size: 13px; font-weight: 400; }
.submit-msg { margin-top: 12px; padding: 10px 14px; border-radius: 8px; font-size: 14px; }
.submit-msg.success { background: #dcfce7; color: #15803d; }
.submit-msg.error { background: #fee2e2; color: #b91c1c; }

.filter-panel { display: flex; flex-direction: column; gap: 14px; }
.filter-tags { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.filter-label { font-size: 14px; font-weight: 600; color: var(--muted); margin-right: 4px; }
.filter-tag {
  padding: 6px 14px; border-radius: 999px; border: 1px solid var(--border);
  background: #fff; color: var(--text); font-size: 13px; cursor: pointer; transition: .15s;
}
.filter-tag:hover { border-color: var(--brand); color: var(--brand); }
.filter-tag.active { background: var(--brand); color: #fff; border-color: var(--brand); }
#filter-status { margin: 0; color: var(--muted); font-size: 14px; }

.filter-search { width: 100%; }
.filter-search input {
  width: 100%; padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border);
  font-size: 15px; outline: none;
}
.filter-search input:focus { border-color: var(--brand); }
.vendor-tags { margin-top: 10px; }
.model-card-link { display: block; color: inherit; text-decoration: none; }
.model-card-link:hover { text-decoration: none; }
.model-card .model-vendor {
  font-size: 13px; color: var(--brand); font-weight: 600; margin: 0 0 8px;
}
.model-card .model-submodels {
  font-size: 13px; color: var(--muted); margin: 0; line-height: 1.5;
}

.review-list { display: grid; gap: 16px; }
.review-item { display: flex; flex-direction: column; gap: 10px; }
.review-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.review-item h3 { margin: 0; font-size: 17px; }
.review-item p { margin: 0; font-size: 14px; color: var(--text); }
.review-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }

@media (max-width: 640px) {
  .hero h1 { font-size: 24px; }
  .main-nav { display: none; }
  .header-inner { padding: 10px 0; }
}