/* =========================================
   Global Styles & Reset
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --warning-color: #f59e0b;
    --info-color: #0ea5e9;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--light-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* =========================================
   Navigation Bar
   ========================================= */
.navbar {
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-admin {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.navbar-admin a {
    color: white !important;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.navbar-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.navbar-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.navbar-menu a:hover {
    color: var(--primary-color);
}

/* =========================================
   Container & Layout
   ========================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

.main-content {
    flex: 1;
    padding: 2rem 0;
}

.admin-content {
    background: var(--light-bg);
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 2rem;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* =========================================
   Alerts & Flash Messages
   ========================================= */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert ul {
    list-style: none;
    padding: 0;
}

.alert li {
    margin-bottom: 0.5rem;
}

.alert-success {
    background: #dcfce7;
    border-color: var(--success-color);
    color: #166534;
}

.alert-error {
    background: #fee2e2;
    border-color: var(--danger-color);
    color: #991b1b;
}

.alert-info {
    background: #dbeafe;
    border-color: var(--info-color);
    color: #1e40af;
}

/* =========================================
   Shifts Calendar
   ========================================= */
.shifts-calendar {
    margin-top: 2rem;
}

.shifts-calendar h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.stall-group {
    margin-bottom: 3rem;
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.stall-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--primary-color);
}

.stall-name {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.stall-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

.date-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.date-section:first-of-type {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.shift-date {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-weight: 600;
}

/* Stall Tabs */
.stall-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.stall-tab-button {
    background: none;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    font-weight: 600;
}

.stall-tab-button:hover {
    color: var(--primary-color);
    background: var(--light-bg);
}

.stall-tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.stall-tab-content {
    display: none;
    animation: fadeInTab 0.3s ease;
}

.stall-tab-content.active {
    display: block;
}

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

.shifts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.shift-card {
    background: var(--light-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 2px solid transparent;
}

.shift-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.shift-claimed {
    border-color: var(--success-color);
    background: #f0fdf4;
}

.shift-full {
    opacity: 0.7;
}

.shift-header {
    margin-bottom: 1rem;
}

.shift-header h4 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.shift-time {
    color: var(--text-secondary);
    font-weight: 600;
    display: block;
}

.shift-body {
    margin-bottom: 1rem;
}

.shift-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.shift-availability {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-top: 1rem;
}

.availability-badge,
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.availability-badge {
    background: var(--light-bg);
    color: var(--text-primary);
}

.badge-available {
    background: #dcfce7;
    color: var(--success-color);
}

.badge-full {
    background: #fee2e2;
    color: var(--danger-color);
}

.status-badge {
    text-transform: uppercase;
    font-size: 0.75rem;
}

.status-available {
    background: var(--success-color);
    color: white;
}

.status-full {
    background: var(--danger-color);
    color: white;
}

.status-claimed {
    background: var(--info-color);
    color: white;
}

.shift-footer {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* =========================================
   Forms
   ========================================= */
.form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    max-width: 600px;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* =========================================
   Buttons
   ========================================= */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #475569;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-block {
    width: 100%;
}

/* =========================================
   Auth Pages
   ========================================= */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.auth-box {
    background: white;
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 450px;
}

.auth-box h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.auth-box p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.auth-links {
    margin-top: 1.5rem;
    text-align: center;
}

.auth-links a {
    color: var(--primary-color);
    font-weight: 600;
}

/* =========================================
   Profile/Dashboard
   ========================================= */
.profile-header {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.profile-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.profile-content {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.my-shifts-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.my-shift-card {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.2s;
}

.my-shift-card:hover {
    border-color: var(--primary-color);
}

.shift-date-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem;
    border-radius: 8px;
    min-width: 80px;
}

.shift-date-badge .day {
    font-size: 2rem;
    font-weight: bold;
    line-height: 1;
}

.shift-date-badge .month {
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-top: 0.25rem;
}

.shift-details {
    flex: 1;
}

.shift-details h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

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

.profile-actions {
    text-align: center;
    margin-top: 2rem;
}

/* =========================================
   Admin Panel
   ========================================= */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.admin-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.stat-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.admin-quick-actions {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.admin-quick-actions h2 {
    margin-bottom: 1rem;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.admin-section {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

/* =========================================
   Tables
   ========================================= */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.table thead {
    background: var(--light-bg);
}

.table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr:hover {
    background: var(--light-bg);
}

.table .actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* =========================================
   Utilities
   ========================================= */
.text-success {
    color: var(--success-color);
    font-weight: 600;
}

.text-muted {
    color: var(--text-muted);
}

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

.empty-state p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.back-link {
    margin-bottom: 1.5rem;
}

.back-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.back-link a:hover {
    text-decoration: underline;
}

/* =========================================
   Footer
   ========================================= */
.footer {
    background: white;
    padding: 2rem 0;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
}

/* =========================================
   Responsive Design
   ========================================= */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .navbar-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .shifts-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .my-shift-card {
        flex-direction: column;
    }
    
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .table th,
    .table td {
        padding: 0.75rem 0.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn-block {
        width: 100%;
    }
}

/* =========================================
   Admin Cards & Grid
   ========================================= */
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.admin-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    overflow: hidden;
}

.card-header {
    background: var(--light-bg);
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    font-size: 1.25rem;
    margin: 0;
    color: var(--text-primary);
}

.card-body {
    padding: 1.5rem;
}

/* Info Grid for Account Information */
.info-grid {
    display: grid;
    gap: 1rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--light-bg);
    border-radius: 4px;
}

.info-item strong {
    color: var(--text-primary);
}

.info-item span {
    color: var(--text-secondary);
}

/* Badge Styles */
.badge-admin {
    background: var(--danger-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 600;
}

/* =========================================
   Profile Tabs
   ========================================= */
.profile-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab-button:hover {
    color: var(--primary-color);
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

.profile-form {
    max-width: 600px;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.profile-info,
.password-tips {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.password-tips ul {
    margin: 1rem 0 0 1.5rem;
}

.password-tips li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .admin-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-tabs,
    .stall-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-button,
    .stall-tab-button {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        white-space: nowrap;
    }
    
    .shifts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero {
        padding: 2rem 1rem;
    }
    
    .auth-box {
        padding: 1.5rem;
    }
}