* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --danger: #ef4444;
  --success: #22c55e;
}
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
.navbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.navbar .logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
}
.navbar .nav-links { display: flex; gap: 12px; align-items: center; }
.navbar a { color: var(--muted); text-decoration: none; font-size: 14px; }
.navbar a:hover { color: var(--primary); }
.container { max-width: 960px; margin: 0 auto; padding: 32px 20px; }
.hero { text-align: center; padding: 60px 20px 40px; }
.hero h1 { font-size: 42px; margin-bottom: 12px; }
.hero h1 span { color: var(--primary); }
.hero p { color: var(--muted); font-size: 18px; margin-bottom: 32px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 20px;
}
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s;
}
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 6px 14px; font-size: 13px; border-radius: 8px; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #dc2626; }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; }
input, textarea, select {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
input:focus, textarea:focus, select:focus { border-color: var(--primary); }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--muted); }
.form-group { margin-bottom: 16px; }
.form-row { display: flex; gap: 10px; }
.form-row input { flex: 1; }
.error-msg { color: var(--danger); font-size: 14px; margin-top: 10px; }
.success-msg { color: var(--success); font-size: 14px; margin-top: 10px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-green { background: #dcfce7; color: #15803d; }
.badge-gray { background: #f1f5f9; color: var(--muted); }
.badge-blue { background: #e0e7ff; color: var(--primary-dark); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
}
.stat-card .num { font-size: 32px; font-weight: 800; color: var(--primary); }
.stat-card .label { font-size: 13px; color: var(--muted); margin-top: 4px; }
.tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 2px solid var(--border); }
.tab {
  padding: 10px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.truncate { max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.short-code { font-family: monospace; color: var(--primary); font-weight: 700; }
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.feature { text-align: center; padding: 24px; }
.feature .icon { font-size: 36px; margin-bottom: 12px; }
.feature h3 { margin-bottom: 8px; font-size: 17px; }
.feature p { color: var(--muted); font-size: 14px; }
.auth-box { max-width: 420px; margin: 60px auto; }
.auth-box h2 { text-align: center; margin-bottom: 24px; }
.auth-box .switch { text-align: center; margin-top: 16px; font-size: 14px; color: var(--muted); }
.auth-box .switch a { color: var(--primary); }
@media (max-width: 640px) {
  .hero h1 { font-size: 30px; }
  .form-row { flex-direction: column; }
  th, td { padding: 8px 6px; font-size: 13px; }
}