:root {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #0f172a;
  --primary-2: #1e293b;
  --accent: #2563eb;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Inter, Arial, sans-serif; background: linear-gradient(to bottom, #f8fafc, #eef2ff 30%, #f1f5f9); color: var(--text); }
a { text-decoration: none; }

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 460px;
  background: var(--panel);
  border-radius: 32px;
  box-shadow: var(--shadow);
  padding: 32px;
}

.brand-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #f1f5f9;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(10px);
  border-right: 1px solid var(--border);
  padding: 28px;
}

.brand-title { margin: 0; font-size: 32px; }
.brand-subtitle { color: var(--muted); line-height: 1.5; }

.nav {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.nav-item {
  display: block;
  padding: 14px 16px;
  border-radius: 18px;
  color: var(--muted);
  background: transparent;
  font-weight: 600;
}

.nav-item:hover,
.nav-item.active {
  background: var(--primary);
  color: #fff;
}

.sidebar-card {
  margin-top: 28px;
  border-radius: 28px;
  padding: 20px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
}

.sidebar-card.dark {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}

.sidebar-card-label {
  font-size: 13px;
  color: #cbd5e1;
}

.sidebar-card-title {
  margin-top: 8px;
  font-size: 20px;
  font-weight: 700;
}

.sidebar-card-text {
  margin-top: 8px;
  color: #cbd5e1;
  word-break: break-word;
}

.content {
  padding: 28px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.page-header h2 {
  margin: 0 0 6px;
  font-size: 38px;
  line-height: 1.1;
}

.page-header p {
  margin: 0;
  color: var(--muted);
}

.header-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.stats-grid,
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.stat-card,
.card,
.feature-card {
  background: var(--panel);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  border: 1px solid rgba(226,232,240,0.8);
}

.stat-card {
  padding: 20px;
}

.stat-label {
  color: var(--muted);
  font-size: 14px;
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  margin-top: 6px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 16px;
  margin-top: 16px;
}

.dashboard-grid.single-row {
  grid-template-columns: 1fr;
}

.card {
  padding: 24px;
}

.card-header h3 {
  margin: 0 0 6px;
  font-size: 24px;
}

.card-header p {
  margin: 0 0 20px;
  color: var(--muted);
}

.stack-list {
  display: grid;
  gap: 12px;
}

.participant-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--text);
  background: #fff;
}

.participant-row:hover {
  transform: translateY(-1px);
  transition: 0.2s ease;
  box-shadow: 0 6px 20px rgba(15,23,42,0.06);
}

.static-row:hover { transform: none; box-shadow: none; }
.participant-name { font-weight: 700; }
.participant-meta { color: var(--muted); font-size: 14px; margin-top: 4px; }
.participant-right { text-align: right; }

.badge {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 12px;
  font-weight: 700;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.info-box {
  background: var(--panel-soft);
  border-radius: 20px;
  padding: 18px;
  border: 1px solid var(--border);
}

.info-box h4 {
  margin: 0 0 12px;
  font-size: 18px;
}

.info-box p,
.contact-row {
  margin: 0 0 10px;
  color: #334155;
  line-height: 1.5;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 12px;
}

.feature-card {
  padding: 20px;
  font-weight: 600;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.form-stack {
  display: grid;
  gap: 16px;
}

.full-width {
  grid-column: 1 / -1;
}

label span,
.switch-row strong {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

label small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

input,
select,
textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #fff;
  font: inherit;
}

textarea { resize: vertical; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 18px;
  border-radius: 18px;
  border: 0;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.button:hover { opacity: 0.95; }

.button-secondary {
  background: #e2e8f0;
  color: var(--primary);
}

.button-light {
  margin-top: 14px;
  background: #fff;
  color: var(--primary);
}

.narrow-card {
  max-width: 800px;
}

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel-soft);
}

.switch-row input[type="checkbox"] {
  width: 22px;
  height: 22px;
}

.alert.error {
  background: #fee2e2;
  color: #991b1b;
  padding: 14px 16px;
  border-radius: 16px;
  margin-bottom: 16px;
}

@media (max-width: 1100px) {
  .shell,
  .dashboard-grid,
  .stats-grid,
  .feature-grid,
  .detail-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 820px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .content,
  .sidebar {
    padding: 20px;
  }

  .page-header {
    flex-direction: column;
  }
}