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

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #242424;
    --bg-tertiary: #2d2d2d;
    --bg-hover: #333333;
    --text-primary: #ffffff;
    --text-secondary: #b4b4b4;
    --text-muted: #888888;
    --border-color: #404040;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #8b5cf6;
    --sidebar-width: 260px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Login Screen */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    padding: 20px;
}

.login-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 48px 40px;
    max-width: 440px;
    width: 100%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo img {
    max-width: 280px;
    height: auto;
    filter: brightness(1.1);
}

.login-card h1 {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 15px;
}

.login-card .form-group {
    margin-bottom: 24px;
}

.login-card .form-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.login-card .form-group label i {
    margin-right: 6px;
    color: var(--accent-blue);
}

.login-card input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 14px 16px;
    border-radius: 8px;
    font-size: 15px;
    color: var(--text-primary);
    transition: all 0.3s;
}

.login-card input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn-block {
    width: 100%;
    justify-content: center;
    margin-top: 8px;
}

.login-help {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.login-help p {
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 13px;
}

.login-help small {
    color: var(--text-muted);
    font-size: 12px;
    display: block;
    margin: 4px 0;
}

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

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.sidebar-logo {
    max-width: 220px;
    height: auto;
    display: block;
    margin: 0 auto;
    filter: brightness(1.05);
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header i {
    color: var(--accent-blue);
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-link.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-left-color: var(--accent-blue);
}

.nav-link i {
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.user-info i {
    font-size: 32px;
}

.user-details {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.user-details span {
    color: var(--text-primary);
    font-weight: 500;
}

.user-details small {
    color: var(--text-muted);
    font-size: 12px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg-primary);
}

/* Top Bar */
.top-bar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.current-time {
    color: var(--text-secondary);
    font-size: 14px;
}

.editor-select {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
}

/* Page Styles */
.page {
    display: none;
    padding: 30px;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

.page-header {
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 16px;
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 20px;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.card-body {
    padding: 24px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

/* 4-column grid for dashboard */
.stats-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

/* 3-column grid for expense KPIs */
.stats-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

/* Expense KPIs Section */
.expense-kpis {
    margin-bottom: 30px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.stat-card-mini {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.stat-mini-label {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 8px;
}

.stat-mini-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-green);
}

/* Dashboard Grid 3 columns */
.dashboard-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

/* Table Filter in Card Header */
.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.table-filter {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.table-filter label {
    color: var(--text-secondary);
    font-size: 13px;
}

.filter-select {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.stat-content h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

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

.form-group label {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.form-group input[readonly] {
    background: var(--bg-hover);
    cursor: not-allowed;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    font-family: inherit;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

.btn-primary:hover {
    background: #2563eb;
}

.btn-success {
    background: var(--accent-green);
    color: white;
}

.btn-success:hover {
    background: #059669;
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

.btn-google {
    background: white;
    color: #444;
    border: 1px solid #ddd;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-google:hover {
    background: #f8f9fa;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-google i {
    color: #4285f4;
    margin-right: 8px;
}

.btn-info {
    background: var(--accent-purple);
    color: white;
}

.btn-info:hover {
    background: #7c3aed;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quick-actions .btn {
    justify-content: center;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

table td {
    padding: 14px 16px;
    border-top: 1px solid var(--border-color);
}

table tbody tr {
    transition: background 0.2s;
}

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

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 20px;
}

/* Time Tracker */
.tracker-container {
    max-width: 900px;
    margin: 0 auto;
}

.tracker-card {
    margin-bottom: 30px;
}

.text-center {
    text-align: center;
}

.tracker-display {
    margin-bottom: 30px;
}

.current-session h2 {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 20px;
}

.session-time {
    font-size: 64px;
    font-weight: 700;
    color: var(--accent-blue);
    font-variant-numeric: tabular-nums;
    margin-bottom: 12px;
}

.session-status {
    color: var(--text-secondary);
    font-size: 16px;
}

.tracker-controls {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 20px;
}

.tracker-info {
    color: var(--text-muted);
    font-size: 14px;
}

/* Tracker Updates */
.tracker-card .tracker-display {
    text-align: center;
    padding: 20px;
}

.tracker-status {
    color: var(--text-secondary);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.session-info {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 12px;
}

/* Timezone Info */
.timezone-info {
    color: var(--text-muted);
    font-size: 13px;
}

/* Bulk Actions */
.bulk-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.bulk-actions .btn {
    flex: 0 0 auto;
}

/* Payment Status Badge */
.badge-paid {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
}

.badge-unpaid {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
}

/* Selected Count */
#selected-count {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: normal;
}

/* Checkbox Styling */
input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-blue);
}

/* Payment Overview */
#payment-overview {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.payment-stat {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: 8px;
}

.payment-stat-label {
    color: var(--text-secondary);
}

.payment-stat-value {
    font-weight: 600;
}

/* Responsive Updates */
@media (max-width: 1200px) {
    .stats-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .login-card {
        padding: 32px 24px;
    }
    
    .login-logo img {
        max-width: 220px;
    }
    
    .sidebar-logo {
        max-width: 180px;
    }
    
    .bulk-actions {
        flex-direction: column;
    }
    
    .bulk-actions .btn {
        width: 100%;
    }
    
    .stats-grid-4,
    .stats-grid-3,
    .dashboard-grid-3 {
        grid-template-columns: 1fr;
    }
    
    .table-filter {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }
    
    .filter-select {
        width: 100%;
    }
}

/* Performance Filters */
.filters-bar {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--accent-green);
    color: white;
    padding: 16px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    display: none;
    align-items: center;
    gap: 12px;
    z-index: 10000;
    animation: slideIn 0.3s ease;
}

.toast.show {
    display: flex;
}

.toast.error {
    background: var(--accent-red);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent-red);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--accent-orange);
}

/* Action Buttons */
.action-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    transition: all 0.2s;
}

.action-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.action-btn.delete {
    color: var(--accent-red);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .menu-toggle {
        display: block;
    }

    .page {
        padding: 20px;
    }

    .page-header h1 {
        font-size: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .filters-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .tracker-controls {
        flex-direction: column;
    }

    .session-time {
        font-size: 48px;
    }

    table {
        font-size: 13px;
    }

    table th,
    table td {
        padding: 10px 12px;
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: 12px 16px;
    }

    .top-bar-right {
        flex-direction: column;
        align-items: flex-end;
        gap: 8px;
    }

    .stat-card {
        flex-direction: column;
        text-align: center;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}