* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --border: #e6e9ef;
  --text: #1f2d3d;
  --muted: #7a8494;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff4ff;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, .10);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 14px;
}

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

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

.icon { width: 1em; height: 1em; display: inline-block; vertical-align: -0.125em; }
.icon-lg { font-size: 1.5rem; }
.icon-xl { font-size: 2rem; }

/* ---------- Header ---------- */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}
.logo .icon { color: var(--primary); font-size: 1.6rem; }
.logo b { color: var(--primary); }
.nav { display: flex; gap: 4px; }
.nav a {
  color: var(--muted);
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 8px;
  transition: background .15s, color .15s;
}
.nav a:hover { background: var(--primary-soft); color: var(--primary); }
.nav a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.header-user { display: flex; align-items: center; gap: 12px; }
.user-chip {
  display: flex; align-items: center; gap: 8px;
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
}
.user-chip img {
  width: 32px; height: 32px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--border);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  transition: all .15s;
  line-height: 1.4;
}
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 12px 26px; font-size: 15px; border-radius: 10px; }
.btn-block { display: flex; width: 100%; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.btn-ghost { background: var(--card); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger-outline { background: var(--card); color: #dc2626; border-color: #fecaca; }
.btn-danger-outline:hover { background: #fef2f2; color: #b91c1c; }

/* ---------- Page ---------- */
.page-body { min-height: calc(100vh - 170px); padding: 28px 0 48px; }

/* ---------- Hero ---------- */
.hero {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 56px 40px;
  text-align: center;
  margin-bottom: 24px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 { font-size: 32px; margin-bottom: 14px; letter-spacing: .5px; }
.hero p {
  max-width: 560px; margin: 0 auto 26px;
  color: var(--muted); font-size: 15px;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; }

/* ---------- Stats ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}
.stat-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-align: center;
}
.stat-num { font-size: 26px; font-weight: 800; color: var(--text); }
.stat-label { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- Sections ---------- */
.section { margin-bottom: 44px; }
.section-title {
  font-size: 18px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title .icon { color: var(--primary); font-size: 1.3rem; }

/* ---------- Feature cards ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 20px;
  transition: box-shadow .2s, transform .2s;
}
.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}
.feature-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 14px;
}
.feature-card h3 { font-size: 15px; margin-bottom: 6px; }
.feature-card p { font-size: 13px; color: var(--muted); }

/* ---------- Channel grid ---------- */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.channel-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  color: var(--text);
  transition: box-shadow .2s, transform .2s;
}
.channel-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  color: var(--text);
}
.channel-icon {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
  background: var(--primary-soft);
  color: var(--primary);
}
.channel-name { flex: 1; font-weight: 600; font-size: 14px; }
.channel-link { font-size: 12px; color: var(--muted); }
.channel-link .icon { font-size: .9rem; vertical-align: -0.1em; }

/* ---------- Members ---------- */
.member-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.member-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 14px;
}
.member-item img {
  width: 42px; height: 42px;
  border-radius: 50%; object-fit: cover;
  border: 2px solid var(--border);
}
.member-name { font-size: 13px; font-weight: 600; }
.member-meta { font-size: 12px; color: var(--muted); }
.empty-tip { grid-column: 1 / -1; text-align: center; color: var(--muted); padding: 30px 0; }

/* ---------- Login page ---------- */
.login-page { display: flex; justify-content: center; padding: 12px 0; }
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  padding: 36px 34px;
}
.login-head { text-align: center; margin-bottom: 26px; }
.login-head .icon { color: var(--primary); font-size: 2.2rem; margin-bottom: 8px; }
.login-head h2 { font-size: 22px; margin-bottom: 6px; }
.login-head p { font-size: 13px; color: var(--muted); }
.login-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.login-option {
  display: flex; align-items: center; gap: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 13px; font-weight: 600;
  transition: border-color .15s, box-shadow .15s;
}
.login-option:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(37, 99, 235, .10);
  color: var(--text);
}
.login-ico {
  width: 34px; height: 34px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  background: var(--primary-soft);
  color: var(--primary);
  flex-shrink: 0;
}
.login-option .arrow { margin-left: auto; color: #c3cad6; }
.login-option .arrow .icon { font-size: 1rem; vertical-align: -0.15em; }
.login-note { margin-top: 24px; padding-top: 18px; border-top: 1px dashed var(--border); }
.login-note p { font-size: 12px; color: var(--muted); text-align: center; line-height: 1.8; }

/* ---------- User center ---------- */
.profile-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
  align-items: start;
}
.profile-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 22px;
  text-align: center;
}
.avatar-wrap img {
  width: 88px; height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary-soft);
  margin-bottom: 12px;
}
.profile-card h3 { font-size: 17px; margin-bottom: 8px; }
.profile-type { margin-bottom: 16px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--primary-soft); color: var(--primary);
  font-size: 12px; font-weight: 600;
  border-radius: 999px;
  padding: 3px 12px;
  margin: 0 2px;
}
.tag .icon { font-size: .9rem; }
.tag-muted { background: #f1f4f9; color: var(--muted); }
.profile-stats {
  display: flex;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
  padding: 14px 0;
}
.ps-item { flex: 1; }
.ps-num { font-size: 18px; font-weight: 800; }
.ps-label { font-size: 12px; color: var(--muted); }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.panel-title {
  font-size: 15px; margin-bottom: 16px;
  padding-bottom: 12px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px;
}
.panel-title .icon { color: var(--primary); font-size: 1.1rem; }
.info-table { width: 100%; border-collapse: collapse; }
.info-table th, .info-table td {
  text-align: left;
  padding: 10px 12px;
  font-size: 13px;
  border-bottom: 1px solid #f2f5f9;
}
.info-table tr:last-child th, .info-table tr:last-child td { border-bottom: none; }
.info-table th { width: 150px; color: var(--muted); font-weight: 500; }
.mono {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12px; word-break: break-all;
}
.copy-cell { display: inline-flex; align-items: center; gap: 6px; }
.copy-btn {
  border: none; background: none; cursor: pointer;
  color: var(--muted); font-size: 1rem;
  padding: 2px; border-radius: 4px;
}
.copy-btn:hover { color: var(--primary); background: var(--primary-soft); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  margin-top: 20px;
}
.site-footer p { font-size: 13px; color: var(--muted); }
.site-footer .footer-sub { font-size: 12px; margin-top: 4px; color: #a5adba; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .feature-grid, .channel-grid, .member-list, .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .profile-layout { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .feature-grid, .channel-grid, .member-list, .stats-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .hero { padding: 40px 20px; }
  .hero h1 { font-size: 24px; }
}