/* ============================================
   Realtors Academy - Portal Stylesheet
   Dark/Light theme via CSS custom properties
   ============================================ */

/* --- Theme Variables --- */
:root {
    --bg: #f5f6f8;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #bfdbfe;
    --sidebar-bg: #e5e5e5;
    --topbar-bg: #ffffff;
    --correct: #16a34a;
    --incorrect: #dc2626;
    --warning: #f59e0b;
}

[data-theme="dark"] {
    --bg: #3a3a50;
    --card-bg: #424258;
    --text: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #7a7a88;
    --border: #50506a;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: #1e3a5f;
    --sidebar-bg: #1a1a2a;
    --topbar-bg: #2a2a3a;
    --correct: #22c55e;
    --incorrect: #ef4444;
    --warning: #fbbf24;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

/* --- Sidebar --- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-logo {
    padding: 20px 16px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-logo .logo-icon {
    width: 32px;
    height: 32px;
    background-color: var(--primary);
    color: #ffffff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.sidebar-state-badge {
    margin: 12px 16px 0;
    padding: 6px 12px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
}

.sidebar-nav {
    flex: 1;
    padding: 8px 0;
    overflow-y: auto;
}

.sidebar-nav .nav-section {
    padding: 16px 16px 4px;
}

.sidebar-nav .nav-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: 6px;
    margin: 2px 8px;
    transition: background-color 0.15s, color 0.15s;
    text-decoration: none;
}

.sidebar-nav .nav-link:hover {
    background-color: var(--border);
    color: var(--text);
    text-decoration: none;
}

.sidebar-nav .nav-link.active {
    background-color: var(--primary);
    color: #ffffff;
}

.sidebar-nav .nav-link .nav-icon {
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

/* Sidebar user info at bottom */
.sidebar-user {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-user .user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 13px;
    flex-shrink: 0;
}

.sidebar-user .user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user .user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user .user-email {
    font-size: 11px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user .logout-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    font-size: 16px;
    transition: color 0.15s;
}

.sidebar-user .logout-btn:hover {
    color: var(--incorrect);
}

/* --- Top Bar --- */
.topbar {
    position: fixed;
    top: 0;
    left: 250px;
    right: 0;
    height: 56px;
    background-color: var(--topbar-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 90;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.topbar-mobile-logo {
    display: none;
    text-decoration: none;
}

.topbar-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.hamburger-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 24px;
    cursor: pointer;
    padding: 4px;
}

.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 16px;
    transition: background-color 0.15s, color 0.15s;
}

.theme-toggle-btn:hover {
    background-color: var(--border);
    color: var(--text);
}

.user-menu {
    position: relative;
}

.user-menu-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 4px 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    font-size: 13px;
    font-weight: 500;
    transition: background-color 0.15s;
}

.user-menu-btn:hover {
    background-color: var(--border);
}

.user-menu-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 4px;
    min-width: 180px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    z-index: 200;
}

.user-menu-dropdown.open {
    display: block;
}

.user-menu-dropdown a,
.user-menu-dropdown button {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px 12px;
    font-size: 13px;
    color: var(--text);
    background: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
}

.user-menu-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
    flex-shrink: 0;
}

.user-menu-name {
    display: inline;
}

.dropdown-header {
    padding: 10px 12px;
    background-color: var(--bg);
    border-radius: 6px 6px 0 0;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border);
    margin: 4px 0;
}

.user-menu-dropdown .logout-item {
    color: var(--incorrect);
}

.user-menu-dropdown .logout-item:hover {
    background-color: rgba(220, 38, 38, 0.1);
}

.user-menu-dropdown a:hover,
.user-menu-dropdown button:hover {
    background-color: var(--border);
    text-decoration: none;
}

/* --- Main Content --- */
.main-content {
    margin-left: 250px;
    padding: 80px 24px 24px;
    min-height: 100vh;
}

/* --- Cards --- */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.card-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: background-color 0.15s, color 0.15s, box-shadow 0.15s;
    text-decoration: none;
    line-height: 1.4;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    text-decoration: none;
}

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

.btn-secondary:hover {
    background-color: var(--border);
    text-decoration: none;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 12px 28px;
    font-size: 16px;
}

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

/* --- Form Elements --- */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-input,
.form-select {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    color: var(--text);
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-input:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

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

/* --- Badges / Pills --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 999px;
}

.badge-high {
    background-color: #fecaca;
    color: #000000;
}

.badge-medium {
    background-color: #fef08a;
    color: #000000;
}

.badge-low {
    background-color: #bbf7d0;
    color: #000000;
}

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

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--card-bg);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] tr:nth-child(even) {
    background-color: rgba(255, 255, 255, 0.03);
}

/* --- Stats Cards --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.stat-card .stat-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
}

.stat-card .stat-detail {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* --- Progress Bars --- */
.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar .progress-fill {
    height: 100%;
    background-color: var(--primary);
    border-radius: 999px;
    transition: width 0.4s ease;
}

.progress-bar .progress-fill.correct {
    background-color: var(--correct);
}

.progress-bar .progress-fill.incorrect {
    background-color: var(--incorrect);
}

/* --- Alerts --- */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 16px;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

[data-theme="dark"] .alert-success {
    background-color: rgba(34, 197, 94, 0.15);
    color: #86efac;
    border-color: rgba(34, 197, 94, 0.3);
}

[data-theme="dark"] .alert-error {
    background-color: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
    border-color: rgba(239, 68, 68, 0.3);
}

/* --- Quiz Styles --- */
.quiz-option {
    background-color: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 14px 18px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: border-color 0.15s, background-color 0.15s;
    font-size: 14px;
    color: var(--text);
}

.quiz-option:hover {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.quiz-option.selected {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.quiz-option.correct {
    border-color: var(--correct);
    background-color: rgba(22, 163, 74, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--incorrect);
    background-color: rgba(220, 38, 38, 0.1);
}

/* --- Flashcard --- */
.flashcard-container {
    perspective: 1000px;
    width: 100%;
    max-width: 640px;
    height: 380px;
    margin: 0 auto;
}

.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    background-color: var(--card-bg);
    border: 2px solid var(--primary-light);
    border-radius: 16px;
    padding: 32px 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 18px;
    line-height: 1.6;
    color: var(--text);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.flashcard-back {
    transform: rotateY(180deg);
}

/* Flashcard inner elements */
.fc-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.fc-content {
    font-size: 19px;
    line-height: 1.6;
    font-weight: 500;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fc-flip-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 16px;
}

.fc-citation {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 12px;
    font-style: italic;
}

/* Navigation row */
.fc-nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
    padding: 0 4px;
}

.fc-arrow-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text);
    font-size: 22px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s, border-color 0.15s;
    line-height: 1;
}

.fc-arrow-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

.fc-arrow-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* Keyboard hints */
.fc-kbd-hints {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-muted);
}

.fc-kbd-group {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.fc-kbd-dot {
    margin: 0 4px;
}

.fc-kbd-hints kbd {
    padding: 2px 7px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 11px;
    font-family: inherit;
    color: var(--text-secondary);
}

/* Rating section */
.fc-rating-section {
    text-align: center;
    margin-top: 20px;
    animation: fcFadeIn 0.3s ease;
}

@keyframes fcFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.fc-rating-prompt {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 500;
}

.fc-rating-buttons {
    display: flex;
    justify-content: center;
    gap: 8px;
}

.fc-rate-btn {
    padding: 8px 18px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    transition: transform 0.1s, box-shadow 0.15s;
}

.fc-rate-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
}

.fc-rate-label { font-size: 14px; }
.fc-rate-key { font-size: 10px; opacity: 0.7; }

.fc-rate-again { background-color: var(--incorrect); }
.fc-rate-hard { background-color: var(--warning); color: #000; }
.fc-rate-good { background-color: var(--primary); }
.fc-rate-easy { background-color: var(--correct); }

@media (max-width: 640px) {
    .fc-hint-desktop { display: none; }
    .flashcard-container { height: 320px; }
    .fc-content { font-size: 16px; }
    .fc-rating-buttons { gap: 6px; }
    .fc-rate-btn { padding: 8px 12px; }
}

/* --- Study Tools Grid (Dashboard) --- */
.study-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.study-tool-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.study-tool-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    text-decoration: none;
}

.study-tool-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.study-tool-info {
    flex: 1;
    min-width: 0;
}

.study-tool-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}

.study-tool-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .study-tools-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .study-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* --- Study Tool Cards v2 (matching original portal) --- */
.study-tool-card-v2 {
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background-color: var(--card-bg);
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
    display: block;
}

.study-tool-card-v2:hover {
    border-color: var(--primary-light);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    text-decoration: none;
}

.stc-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.stc-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text);
}

.study-tool-card-v2:hover .stc-title {
    color: var(--primary);
}

.stc-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 1024px) {
    .study-tool-card-v2 { }
    div:has(> .study-tool-card-v2) { grid-template-columns: repeat(2, 1fr) !important; }
}

@media (max-width: 640px) {
    div:has(> .study-tool-card-v2) { grid-template-columns: 1fr !important; }
}

/* Responsive stats grid */
@media (max-width: 768px) {
    div:has(> .card[style*="padding: 16px"]) { grid-template-columns: repeat(2, 1fr) !important; }
}

/* --- Topic Cards (matching original panel style) --- */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.topic-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--text);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.topic-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
    text-decoration: none;
}

.topic-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.topic-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    flex-shrink: 0;
}

.topic-card-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
    line-height: 1.3;
}

.topic-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
    flex: 1;
}

.topic-card-counts {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--text);
    margin-bottom: 14px;
    padding: 10px 14px;
    margin-left: -20px;
    margin-right: -20px;
    background-color: var(--bg);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.topic-card-actions {
    display: flex;
    gap: 8px;
}

.topic-card-btn {
    flex: 1;
    text-align: center;
}

@media (max-width: 1024px) {
    .topic-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .topic-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Topic Checkbox Grid (Quiz Selection) --- */
.topic-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.topic-checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border: 1.5px solid var(--text-muted);
    border-radius: 10px;
    cursor: pointer;
    background-color: var(--surface);
    transition: border-color 0.15s, background-color 0.15s;
}

.topic-checkbox-item:hover {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.topic-checkbox-item.selected {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.topic-checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    accent-color: var(--primary);
}

.topic-checkbox-content {
    flex: 1;
    min-width: 0;
}

@media (max-width: 1024px) {
    .topic-checkbox-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .topic-checkbox-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        z-index: 300;
    }

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

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 250;
    }

    .sidebar-overlay.open {
        display: block;
    }

    .topbar {
        left: 0;
    }

    .hamburger-btn {
        display: block;
    }

    .topbar-mobile-logo {
        display: flex;
    }

    .user-menu-name {
        display: none;
    }

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

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

/* --- Login Page --- */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background-color: var(--bg);
}

.login-card {
    width: 100%;
    max-width: 400px;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.login-logo {
    text-align: center;
    margin-bottom: 8px;
}

.login-logo .logo-icon {
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: #ffffff;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
    margin-bottom: 12px;
}

.login-title {
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.login-subtitle {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

/* --- Utility Classes --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 4px; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.mb-4 { margin-bottom: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 13px; }
.text-xs { font-size: 12px; }
.text-lg { font-size: 18px; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.w-full { width: 100%; }
.hidden { display: none; }