:root {
    --bg-color: #fafafa;
    --panel-bg: #ffffff;
    --panel-border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #0d47a1; /* Colors.blue[900] */
    --accent-hover: #1565c0;
    --error-color: #ef4444;
    --success-color: #10b981;
    --card-bg: #e3f2fd; /* Colors.blue[50] */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Roboto', 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

.hidden {
    display: none !important;
}

/* Material Panel Utility */
.material-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0,0,0,0.1);
}

.card-bg {
    background-color: var(--card-bg);
}

/* Layout */
#app {
    display: flex;
    width: 100%;
    height: 100vh;
}

.sidebar {
    width: 250px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    background: var(--accent-color);
    color: white;
    z-index: 10;
}

.logo h2 {
    font-weight: 700;
    font-size: 1.8rem;
    margin-bottom: 3rem;
    color: white;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: block;
}

.nav-links a:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.nav-links a.active {
    color: var(--accent-color);
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.content-area {
    flex: 1;
    padding: 2rem 4rem;
    overflow-y: auto;
    position: relative;
    background-color: var(--bg-color);
}

/* Views */
.view {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.view-header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.view-header p {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Auth View */
#auth-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    flex-direction: column;
}

#auth-overlay.hidden {
    display: none;
}

#auth-overlay h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    border: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.primary-btn {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.primary-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

.secondary-btn:hover {
    background: rgba(13, 71, 161, 0.05);
}

/* Cards & Forms */
.card {
    padding: 2rem;
    max-width: 800px;
    margin-bottom: 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background: white;
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    overflow: hidden;
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    border-width: 2px;
}

.prefix {
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    background: #f1f5f9;
    border-right: 1px solid var(--panel-border);
}

input, textarea, select {
    width: 100%;
    padding: 0.75rem;
    background: white;
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

input.no-border {
    border: none;
}

input:focus:not(.no-border), textarea:focus, select:focus {
    border-color: var(--accent-color);
    border-width: 2px;
}

.error-msg {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 0.25rem;
    display: block;
}

/* Profile Specific */
.profile-header {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-right: 1.5rem;
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
}

.stats-overview {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--panel-border);
}

.stat-box {
    text-align: center;
    flex: 1;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Garage Specific */
.garage-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.vehicle-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: white;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
}

.vehicle-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.vehicle-icon {
    width: 40px;
    height: 40px;
    background: var(--card-bg);
    color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.vehicle-details h4 {
    margin: 0;
    font-size: 1.1rem;
}

.vehicle-details p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background 0.2s;
}

.btn-icon:hover {
    background: #fee2e2;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: white;
    width: 100%;
    max-width: 500px;
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
}

.modal-content h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

/* Groups List */
.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.group-card {
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    background: white;
}

.group-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

.group-card h3 {
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.group-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

/* Leaderboard */
.filter-controls {
    display: flex;
    gap: 1rem;
}

.glass-select {
    background: white;
    border: 1px solid var(--panel-border);
    color: var(--text-primary);
    border-radius: 4px;
    padding: 0.5rem 1rem;
    cursor: pointer;
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: white;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
}

.rank {
    font-size: 1.5rem;
    font-weight: 700;
    width: 40px;
    color: var(--text-secondary);
}

.rank-1 { color: #f59e0b; }
.rank-2 { color: #9ca3af; }
.rank-3 { color: #b45309; }

.lb-handle {
    flex: 1;
    font-weight: 600;
    font-size: 1.1rem;
}

.lb-score {
    font-weight: 700;
    color: var(--accent-color);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    #app {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        padding: 1rem 2rem;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    .logo h2 { margin-bottom: 0; }
    .nav-links {
        flex-direction: row;
        display: none; /* In a real app we'd have a hamburger menu */
    }
    .content-area {
        padding: 1.5rem;
    }
}