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

:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Layout === */
.container { max-width: 480px; margin: 0 auto; padding: 16px; }
.container-wide { max-width: 960px; margin: 0 auto; padding: 16px; }

/* === Header === */
.header {
  text-align: center;
  padding: 32px 0 24px;
}
.header h1 {
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header p {
  color: var(--text-secondary);
  margin-top: 4px;
  font-size: 14px;
}

/* === Card === */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}
.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* === Form === */
.form-group { margin-bottom: 14px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  transition: border-color .2s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  width: 100%;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover:not(:disabled) { background: #059669; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover:not(:disabled) { background: #d97706; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 6px 14px; font-size: 13px; width: auto; }

/* === Tabs === */
.tabs {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  background: var(--border);
  border-radius: 8px;
  padding: 3px;
}
.tab {
  flex: 1;
  padding: 8px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all .2s;
  color: var(--text-secondary);
}
.tab.active {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}

/* === Tags === */
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  border: 1.5px solid var(--border);
  transition: all .2s;
  user-select: none;
}
.tag.selected {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.tag:hover:not(.selected) { border-color: var(--primary-light); }

/* === Map === */
.map-container {
  width: 100%;
  height: 200px;
  border-radius: 8px;
  overflow: hidden;
  margin: 12px 0;
  border: 1.5px solid var(--border);
}
.map-container-lg { height: 300px; }
.map-hint {
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 4px;
}

/* === Invite Code === */
.invite-code {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 6px;
  text-align: center;
  color: var(--primary);
  padding: 16px;
  background: #f1f5f9;
  border-radius: 8px;
  margin: 12px 0;
  font-family: 'Courier New', monospace;
}

/* === Restaurant Card === */
.restaurant-card {
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  transition: all .2s;
  cursor: pointer;
}
.restaurant-card:hover { border-color: var(--primary); box-shadow: 0 4px 12px rgba(99,102,241,.15); }
.restaurant-card.selected { border-color: var(--primary); background: #f5f3ff; }
.restaurant-name { font-size: 16px; font-weight: 700; }
.restaurant-meta { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
.restaurant-score {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #fef3c7;
  color: #92400e;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}
.restaurant-travel {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-secondary);
}
.restaurant-travel span {
  display: inline-block;
  background: #f1f5f9;
  padding: 2px 8px;
  border-radius: 4px;
  margin: 2px 4px 2px 0;
}

/* === Participant List === */
.participant-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.participant-item:last-child { border-bottom: none; }
.participant-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  flex-shrink: 0;
}
.participant-info { flex: 1; min-width: 0; }
.participant-name { font-weight: 600; font-size: 14px; }
.participant-detail { font-size: 12px; color: var(--text-secondary); }
.participant-status {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.status-joined { background: #e0e7ff; color: #3730a3; }
.status-departed { background: #fef3c7; color: #92400e; }
.status-arrived { background: #d1fae5; color: #065f46; }

/* === Message Feed === */
.message-feed {
  max-height: 300px;
  overflow-y: auto;
  padding: 8px 0;
}
.message-item {
  padding: 8px 12px;
  margin-bottom: 6px;
  border-radius: 8px;
  font-size: 13px;
  animation: slideIn .3s ease;
}
.message-item.reminder { background: #eff6ff; color: #1e40af; }
.message-item.urgent { background: #fef2f2; color: #991b1b; }
.message-item.notice { background: #f0fdf4; color: #166534; }
.message-item.milestone { background: #faf5ff; color: #6b21a8; font-weight: 600; }
.message-time { font-size: 11px; color: var(--text-secondary); margin-top: 2px; }

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === Departure Info === */
.departure-card {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  margin-bottom: 16px;
}
.departure-time {
  font-size: 32px;
  font-weight: 800;
  margin: 8px 0;
}
.departure-label { font-size: 13px; opacity: .8; }
.departure-countdown {
  font-size: 14px;
  margin-top: 8px;
  padding: 6px 12px;
  background: rgba(255,255,255,.2);
  border-radius: 6px;
  display: inline-block;
}

/* === Grid === */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* === Utility === */
.text-center { text-align: center; }
.text-secondary { color: var(--text-secondary); }
.text-sm { font-size: 13px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.hidden { display: none !important; }
.divider { height: 1px; background: var(--border); margin: 16px 0; }

/* === Loading === */
.loading {
  text-align: center;
  padding: 24px;
  color: var(--text-secondary);
}
.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* === Toast === */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: var(--text);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 9999;
  transition: transform .3s ease;
  box-shadow: var(--shadow-lg);
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* === Responsive === */
@media (min-width: 640px) {
  .container { padding: 24px; }
  .header { padding: 48px 0 32px; }
  .header h1 { font-size: 36px; }
  .map-container { height: 260px; }
  .map-container-lg { height: 400px; }
}

/* === Dashboard Layout === */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 768px) {
  .dashboard-grid {
    grid-template-columns: 1fr 1fr;
  }
  .dashboard-grid .full-width {
    grid-column: 1 / -1;
  }
}