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

:root {
    --primary-color: #1b1b18;
    --secondary-color: #706f6c;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background: #ffffff;
    --surface: #f5f5f5;
    --text-primary: #1b1b18;
    --text-secondary: #706f6c;
    --border-color: #e3e3e0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Header */
.header {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background 0.2s;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Loading */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error Message */
.error-message {
    background: #fee;
    color: var(--danger-color);
    padding: 1rem;
    margin: 1rem;
    border-radius: 0.5rem;
    border-left: 4px solid var(--danger-color);
}

/* Screens */
.screen {
    padding: 1rem;
    max-width: 100%;
}

.screen-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* Login */
.login-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.login-container h2 {
    margin-bottom: 1.5rem;
    text-align: center;
}

.login-container input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: 1rem;
    margin-bottom: 1rem;
}

.btn-primary {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Trips List */
.trips-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.trip-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    cursor: pointer;
    transition: box-shadow 0.2s;
}

.trip-card:hover {
    box-shadow: var(--shadow);
}

.trip-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.trip-route {
    font-weight: 600;
    font-size: 1.1rem;
}

.trip-time {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.trip-info {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.trip-status {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.trip-status.scheduled {
    background: #e0f2fe;
    color: #0369a1;
}

.trip-status.in_progress {
    background: #fef3c7;
    color: #92400e;
}

.trip-status.completed {
    background: #d1fae5;
    color: #065f46;
}

/* Passengers */
.passengers-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.btn-back {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--primary-color);
    padding: 0.5rem;
}

.search-container {
    margin-bottom: 1rem;
}

.search-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
}

.passengers-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.passenger-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
}

.passenger-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.passenger-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.passenger-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.passenger-badges {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge.unpaid {
    background: #fee2e2;
    color: #991b1b;
}

.badge.paid {
    background: #d1fae5;
    color: #065f46;
}

.badge.partial {
    background: #fef3c7;
    color: #92400e;
}

.badge.student {
    background: #dbeafe;
    color: #1e40af;
}

.badge.baggage {
    background: #e9d5ff;
    color: #6b21a8;
}

.passenger-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.boarding-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.3s;
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--success-color);
}

input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.toggle-label {
    font-weight: 600;
    color: var(--text-primary);
}

/* Offline indicator */
.offline-indicator {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--warning-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    z-index: 1000;
    display: none;
}

.offline-indicator.show {
    display: block;
}

/* Sync indicator */
.syncing {
    animation: spin 1s linear infinite;
}