/* ============ CSS VARIABLES FOR THEMING ============ */

:root {
    /* Dark Theme (Default) */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-color: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-color: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
}

/* ============ GLOBAL STYLES ============ */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============ SIDEBAR NAVIGATION ============ */

.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    padding: 1.5rem 0;
    transition: transform 0.3s ease;
    z-index: 1000;
    transform: translateX(-100%);
    border-right: 1px solid var(--border-color);
}

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

.sidebar-header {
    padding: 0 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.3rem;
    color: var(--accent-primary);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
}

.close-btn:hover {
    color: var(--danger);
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
}

.nav-link {
    display: block;
    padding: 0.875rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

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

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

.sidebar-footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

.logout-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.2s;
}

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

/* ============ MAIN CONTENT ============ */

.main-content {
    margin-left: 0;
    flex: 1;
    min-height: 100vh;
}

.topbar {
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.menu-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

.topbar h1 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* Profile Menu */
.user-info {
    position: relative;
}

.profile-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: background 0.2s;
}

.profile-menu:hover {
    background: var(--bg-tertiary);
}

.profile-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--success));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.dropdown-arrow {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.profile-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow);
    min-width: 200px;
    display: none;
    z-index: 1000;
}

.profile-dropdown.show {
    display: block;
}

.profile-dropdown-item {
    padding: 0.875rem 1.25rem;
    cursor: pointer;
    transition: background 0.2s;
    color: var(--text-primary);
}

.profile-dropdown-item:hover {
    background: var(--bg-tertiary);
}

.profile-dropdown-item:first-child {
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}

.profile-dropdown-item:last-child {
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
}

/* ============ AUTHENTICATION PAGES ============ */

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.auth-container {
    max-width: 450px;
    width: 100%;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

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

.auth-header p {
    color: var(--text-secondary);
}

.auth-form-container {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow);
    border: 1px solid var(--border-color);
}

.auth-form-container h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.auth-form-container input {
    width: 100%;
    padding: 0.875rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.auth-form-container input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.error-message {
    color: var(--danger);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    padding: 0.5rem;
    border-radius: 4px;
    background: rgba(239, 68, 68, 0.1);
    display: none;
}

.error-message.show {
    display: block;
}

.auth-btn {
    width: 100%;
    padding: 0.875rem;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.auth-btn:hover {
    background: var(--accent-hover);
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.auth-switch a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* ============ PAGE MANAGEMENT ============ */

.page {
    display: none;
    padding: 2rem;
}

.page.active {
    display: block;
}

.page-header {
    margin-bottom: 2rem;
}

.page-header h2 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
}

/* ============ SEARCH & FILTER CONTROLS ============ */

.search-container {
    margin-bottom: 1.5rem;
}

.search-container input {
    width: 100%;
    max-width: 500px;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s;
}

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

.filter-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
    font-weight: 500;
}

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

.filter-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

/* ============ WELCOME SECTION ============ */

.welcome-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    text-align: center;
}

.welcome-section h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* ============ DASHBOARD STATS ============ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    text-align: center;
    transition: transform 0.2s;
    border: 1px solid var(--border-color);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow);
}

.stat-card h3 {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent-primary);
}

.stat-card.success .stat-number {
    color: var(--success);
}

.stat-card.warning .stat-number {
    color: var(--warning);
}

/* ============ QUICK ACTIONS ============ */

.quick-actions {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.quick-actions h2 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.action-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

.action-btn.secondary:hover {
    opacity: 0.9;
}

/* ============ RECENT ACTIVITY ============ */

.recent-activity {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    border: 1px solid var(--border-color);
}

.recent-activity h2 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.activity-item {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-primary);
}

/* ============ FORMS ============ */

.form-container {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.form-container h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

form {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

input, select {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.2s;
    background: var(--bg-primary);
    color: var(--text-primary);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--accent-hover);
}

/* ============ TABLE STYLES ============ */

.table-container {
    background: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

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

thead {
    background: var(--bg-tertiary);
}

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

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

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

.action-cell {
    display: flex;
    gap: 0.5rem;
}

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

/* ============ CARDS ============ */

.list-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-secondary);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    transition: transform 0.2s;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow);
}

.card-header {
    padding: 1rem 1.5rem;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.card-header h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.card-body {
    padding: 1.5rem;
}

.card-body p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.card-date {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.card-actions {
    padding: 1rem 1.5rem;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.card-actions button {
    flex: 1;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ============ BUTTON VARIANTS ============ */

.success-btn {
    background-color: var(--success) !important;
}

.success-btn:hover {
    opacity: 0.9 !important;
}

.warning-btn {
    background-color: var(--warning) !important;
}

.warning-btn:hover {
    opacity: 0.9 !important;
}

.delete-btn {
    background-color: var(--danger) !important;
}

.delete-btn:hover {
    opacity: 0.9 !important;
}

.btn-primary {
    background-color: var(--accent-primary) !important;
}

.btn-secondary {
    background-color: var(--bg-tertiary) !important;
    color: var(--text-primary) !important;
}

/* ============ STATUS BADGES ============ */

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

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

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

/* ============ MODALS ============ */

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 0 10px 25px var(--shadow);
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--border-color);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--danger);
}

.modal form {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.modal form input,
.modal form select {
    width: 100%;
    min-width: 100%;
}

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

.modal-actions button {
    flex: 1;
}

/* ============ SETTINGS PAGE ============ */

.settings-container {
    display: grid;
    gap: 1.5rem;
}

.settings-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    border: 1px solid var(--border-color);
}

.settings-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.settings-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-label {
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    color: var(--text-primary);
    font-weight: 600;
}

.settings-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.setting-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle-btn:hover {
    background: var(--bg-primary);
}

.danger-zone {
    border: 2px solid var(--danger);
}

.danger-warning {
    color: var(--danger);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.danger-btn {
    background: transparent !important;
    border: 1px solid var(--danger) !important;
    color: var(--danger) !important;
    margin-top: 0.5rem;
}

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

/* ============ SUPPORT & REPORTS ============ */

.support-container, .reports-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.support-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    border: 1px solid var(--border-color);
}

.support-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.support-card li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

.coming-soon {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* ============ EMPTY STATE ============ */

.empty-message {
    text-align: center;
    color: var(--text-muted);
    padding: 3rem 1rem;
    font-size: 1.1rem;
}

/* ============ RESPONSIVE DESIGN ============ */

@media (max-width: 768px) {
    .topbar h1 {
        font-size: 1.2rem;
    }
    
    form {
        flex-direction: column;
    }
    
    input, select, button {
        width: 100%;
        min-width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .list-container {
        grid-template-columns: 1fr;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .filter-container {
        justify-content: stretch;
    }
    
    .filter-btn {
        flex: 1;
    }
}