/* ============================================================
   MathsMaster - Modern, Clean & Responsive Stylesheet
   ============================================================ */

/* --- CSS Variables --- */
:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-light: #e0e7ff;
    --color-primary-50: #eef2ff;
    --color-secondary: #6366f1;
    --color-accent: #06b6d4;

    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-danger: #ef4444;
    --color-danger-light: #fee2e2;

    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-light: #64748b;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

/* --- Layout --- */
.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.main {
    flex: 1;
    padding: 40px 0;
}

/* --- Background Decorations --- */
.bg-decoration {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    pointer-events: none;
    z-index: -1;
}

.bg-decoration-1 {
    width: 500px;
    height: 500px;
    background: var(--color-primary-light);
    top: -150px;
    right: -200px;
}

.bg-decoration-2 {
    width: 400px;
    height: 400px;
    background: #dbeafe;
    bottom: -100px;
    left: -150px;
}

/* --- Header --- */
.header {
    padding: 24px 0;
    background: transparent;
}

.header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

.tagline {
    margin-top: 8px;
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 480px;
}

/* --- Cards --- */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-gray-100);
    overflow: hidden;
}

.card-header {
    padding: 28px 32px 0;
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 4px;
}

.card-header p {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* --- Form --- */
.form-card {
    margin-bottom: 48px;
}

.form-card form {
    padding: 24px 32px 32px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-gray-700);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.label-icon {
    display: flex;
    color: var(--color-primary);
    flex-shrink: 0;
}

.form-select {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    padding: 12px 40px 12px 14px;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--color-gray-600);
    background-color: var(--color-gray-50);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 18px;
}

.form-select:hover {
    border-color: var(--color-gray-300);
    background-color: #fff;
}

.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    background-color: #fff;
}

.form-select.selected {
    color: var(--color-gray-900);
    font-weight: 500;
}

.form-select option {
    color: var(--color-gray-800);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-sans);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-200);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
}

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

.btn-generate {
    flex: 1;
    padding: 16px 24px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

.btn-random {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
    flex: 0 0 auto;
    white-space: nowrap;
}

.btn-random:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.45);
}

.btn-random:active {
    transform: translateY(0);
}

.form-select-shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.05rem;
}

.btn-download {
    padding: 10px 20px;
}

/* --- Features Grid --- */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--color-surface);
    padding: 28px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-100);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    text-align: center;
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.feature-icon-purple {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.feature-icon-blue {
    background: #dbeafe;
    color: #2563eb;
}

.feature-icon-green {
    background: var(--color-success-light);
    color: var(--color-success);
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--color-gray-900);
}

.feature-card p {
    font-size: 0.85rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* --- Worksheet Meta --- */
.worksheet-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.meta-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 100px;
    letter-spacing: 0.02em;
}

.badge-purple {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.badge-blue {
    background: #dbeafe;
    color: #2563eb;
}

.badge-easy {
    background: var(--color-success-light);
    color: #059669;
}

.badge-moderate {
    background: var(--color-warning-light);
    color: #d97706;
}

.badge-hard {
    background: var(--color-danger-light);
    color: #dc2626;
}

.badge-gray {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

/* Star reward badges */
.badge-star-bronze { background: #fed7aa; color: #c2410c; }
.badge-star-silver { background: #e5e7eb; color: #4b5563; }
.badge-star-gold   { background: #fef3c7; color: #b45309; }

/* Star reward picker (assignment form) */
.star-reward-picker {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.star-reward-option {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.star-reward-option:hover {
    border-color: #d1d5db;
    background: #f9fafb;
}

.star-reward-option:has(input:checked) {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
}

.star-option-bronze:has(input:checked) {
    border-color: #c2410c;
    background: #fed7aa;
}

.star-option-silver:has(input:checked) {
    border-color: #6b7280;
    background: #e5e7eb;
}

.star-option-gold:has(input:checked) {
    border-color: #b45309;
    background: #fef3c7;
}

.star-reward-option input[type="radio"] {
    display: none;
}

.star-reward-label {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Star earned card (worksheet results) */
.star-earned-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    border-radius: 12px;
    margin-bottom: 24px;
}

.star-earned-icon {
    font-size: 2.5rem;
    line-height: 1;
}

.star-earned-text strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.star-earned-text p {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.8;
}

.star-earned-bronze {
    background: #fed7aa;
    border: 2px solid #c2410c;
    color: #7c2d12;
}

.star-earned-silver {
    background: #e5e7eb;
    border: 2px solid #9ca3af;
    color: #374151;
}

.star-earned-gold {
    background: #fef3c7;
    border: 2px solid #f59e0b;
    color: #78350f;
}

.worksheet-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* --- Questions List --- */
.worksheet-card {
    margin-bottom: 24px;
}

.questions-list {
    padding: 8px 0;
}

.question-row {
    display: flex;
    align-items: center;
    padding: 14px 32px;
    gap: 12px;
    transition: background var(--transition);
}

.question-row:hover {
    background: var(--color-primary-50);
}

.question-row-alt {
    background: var(--color-gray-50);
}

.question-num {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 32px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.question-text {
    flex: 1;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-gray-800);
}

.question-blank {
    color: var(--color-gray-300);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* --- Geometry Shape Diagrams --- */
.geo-shape {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    padding: 4px;
    margin: 2px 0;
}

.geo-shape svg {
    display: block;
}

.question-row:has(.geo-shape) {
    align-items: center;
    flex-wrap: wrap;
    padding-top: 10px;
    padding-bottom: 10px;
}

@media (max-width: 480px) {
    .geo-shape svg {
        width: 120px;
        height: auto;
    }
}

@media print {
    .geo-shape {
        border-color: #ccc;
        background: #fff;
    }
}

/* --- Answer Input Fields --- */
.answer-input-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.answer-input {
    width: 130px;
    padding: 7px 12px;
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-gray-800);
    background: var(--color-surface);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.answer-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.answer-input[readonly] {
    cursor: default;
    background: var(--color-gray-50);
}

.answer-feedback {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.correct-ans {
    color: var(--color-danger);
    font-weight: 700;
}

/* Graded row states */
.answer-correct {
    background: #ecfdf5 !important;
    border-left: 3px solid #059669;
}

.answer-correct .question-num {
    background: #d1fae5;
    color: #059669;
}

.answer-correct .answer-input {
    border-color: #059669;
    color: #059669;
    background: #f0fdf4;
}

.answer-correct .answer-feedback {
    color: #059669;
}

.answer-wrong {
    background: #fef2f2 !important;
    border-left: 3px solid #dc2626;
}

.answer-wrong .question-num {
    background: #fee2e2;
    color: #dc2626;
}

.answer-wrong .answer-input {
    border-color: #dc2626;
    color: #dc2626;
    background: #fef2f2;
}

.answer-wrong .answer-feedback {
    color: #dc2626;
}

/* Submit button wrap */
.quiz-submit-wrap {
    padding: 20px 32px 24px;
    display: flex;
    gap: 12px;
}

.btn-submit-quiz {
    flex: 1;
}

/* --- Score Results Card --- */
.score-card {
    margin-bottom: 24px;
    overflow: hidden;
}

.score-card-header h2 {
    display: flex;
    align-items: center;
    gap: 8px;
}

.score-body {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.score-ring-wrap {
    position: relative;
    width: 130px;
    height: 130px;
    flex-shrink: 0;
}

.score-ring {
    width: 130px;
    height: 130px;
    transform: rotate(-90deg);
}

.score-ring-bg {
    fill: none;
    stroke: var(--color-gray-200);
    stroke-width: 8;
}

.score-ring-fill {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease-out, stroke 0.3s;
}

.score-ring-label {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-pct {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1;
    color: var(--color-primary);
}

.score-fraction {
    font-size: 0.8rem;
    color: var(--color-gray-500);
    font-weight: 600;
    margin-top: 4px;
}

.score-details {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.score-grade {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.score-grade-letter {
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
}

.score-summary {
    display: flex;
    gap: 20px;
}

.score-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-gray-800);
    line-height: 1;
}

.score-stat-label {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    font-weight: 600;
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* --- Score Breakdown --- */
.score-breakdown {
    padding: 0 32px 32px;
}

.score-breakdown h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-gray-800);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-gray-200);
}

.breakdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.breakdown-section h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-gray-600);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.breakdown-table th {
    text-align: left;
    padding: 6px 8px;
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    border-bottom: 1px solid var(--color-gray-200);
}

.breakdown-table td {
    padding: 8px 8px;
    border-bottom: 1px solid var(--color-gray-100);
    color: var(--color-gray-700);
    font-weight: 500;
}

.breakdown-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 700;
}

.breakdown-pts-label {
    font-size: 0.7rem;
    color: var(--color-gray-400);
    font-weight: 500;
}

.mini-bar {
    display: inline-block;
    width: 60px;
    height: 6px;
    background: var(--color-gray-200);
    border-radius: 3px;
    overflow: hidden;
    vertical-align: middle;
}

.mini-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.8s ease-out;
}

.mini-pct {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-gray-600);
    margin-left: 6px;
}

.points-legend {
    margin-top: 16px;
    padding: 10px 14px;
    background: var(--color-gray-50);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 0.8rem;
}

.legend-title {
    font-weight: 700;
    color: var(--color-gray-600);
}

.legend-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.75rem;
}

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

    .score-body {
        padding: 24px 20px;
        gap: 20px;
    }

    .score-breakdown {
        padding: 0 20px 24px;
    }

    .answer-input {
        width: 100px;
    }

    .quiz-submit-wrap {
        padding: 16px 20px 20px;
    }
}

@media (max-width: 480px) {
    .answer-input {
        width: 80px;
        font-size: 0.8rem;
        padding: 6px 8px;
    }

    .answer-feedback {
        font-size: 0.7rem;
    }

    .score-summary {
        gap: 14px;
    }
}

@media print {
    .quiz-submit-wrap,
    .score-card {
        display: none;
    }

    .answer-input {
        border: none;
        background: transparent;
    }
}

/* --- Answers Section --- */
.answers-card {
    margin-bottom: 32px;
}

.answers-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 32px !important;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition);
}

.answers-header:hover {
    background: var(--color-gray-50);
}

.btn-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--color-primary);
    background: var(--color-primary-50);
    border: 1px solid var(--color-primary-light);
    border-radius: 100px;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-toggle:hover {
    background: var(--color-primary-light);
}

.toggle-icon {
    transition: transform 300ms ease;
}

.answers-body {
    padding: 16px 32px 28px;
    border-top: 1px solid var(--color-gray-100);
}

.answers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px 24px;
}

.answer-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--color-gray-50);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-success);
}

.answer-num {
    font-weight: 700;
    color: var(--color-gray-500);
    font-size: 0.85rem;
    min-width: 24px;
}

.answer-text {
    font-weight: 600;
    color: var(--color-gray-800);
}

/* --- Bottom Actions --- */
.bottom-actions {
    text-align: center;
    padding: 16px 0 24px;
}

/* --- Footer --- */
.footer {
    padding: 24px 0;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-gray-100);
}

/* ============================================================
   Responsive Breakpoints
   ============================================================ */

/* Tablets */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .main {
        padding: 28px 0;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .form-card form {
        padding: 20px 20px 24px;
    }

    .card-header {
        padding: 24px 20px 0;
    }

    .features {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .feature-card {
        padding: 20px;
        display: flex;
        align-items: center;
        gap: 16px;
        text-align: left;
    }

    .feature-icon {
        margin: 0;
        flex-shrink: 0;
    }

    .feature-card h3 {
        margin-bottom: 2px;
    }

    .worksheet-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .worksheet-actions {
        width: 100%;
    }

    .worksheet-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .question-row {
        padding: 12px 20px;
    }

    .answers-header {
        padding: 16px 20px !important;
    }

    .answers-body {
        padding: 12px 20px 20px;
    }

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

/* Small phones */
@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .logo h1 {
        font-size: 1.3rem;
    }

    .tagline {
        font-size: 0.95rem;
    }

    .card {
        border-radius: var(--radius-md);
    }

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

    .btn-generate {
        padding: 14px 20px;
        font-size: 1rem;
    }

    .question-row {
        padding: 10px 14px;
        gap: 10px;
    }

    .question-num {
        min-width: 34px;
        height: 28px;
        font-size: 0.75rem;
    }

    .question-text {
        font-size: 0.9rem;
    }

    .meta-badges {
        gap: 6px;
    }

    .badge {
        padding: 4px 10px;
        font-size: 0.75rem;
    }

    .bg-decoration-1 {
        width: 300px;
        height: 300px;
    }

    .bg-decoration-2 {
        width: 250px;
        height: 250px;
    }
}

/* Large screens */
@media (min-width: 1024px) {
    .container {
        max-width: 860px;
    }
}

/* ============================================================
   Navigation Bar
   ============================================================ */
.container-wide {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-gray-600);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-primary-50);
}

/* --- Button Sizes --- */
.btn-sm {
    padding: 8px 16px;
    font-size: 0.82rem;
    gap: 6px;
}

.btn-danger {
    background: var(--color-danger-light);
    color: var(--color-danger);
    border: 1px solid #fecaca;
}

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

/* --- User Menu Dropdown --- */
.user-menu {
    position: relative;
    margin-left: 8px;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px 6px 6px;
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: 100px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-gray-700);
    transition: all var(--transition);
}

.user-menu-btn:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-300);
}

.user-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.user-avatar-lg {
    width: 38px;
    height: 38px;
    font-size: 0.9rem;
}

.user-menu-name {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-menu-arrow {
    transition: transform var(--transition);
    opacity: 0.5;
}

.user-menu-btn[aria-expanded="true"] .user-menu-arrow {
    transform: rotate(180deg);
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 220px;
    background: var(--color-surface);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition);
    z-index: 100;
}

.user-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-gray-700);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.dropdown-item:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

.dropdown-item-danger {
    color: var(--color-danger);
}

.dropdown-item-danger:hover {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

.dropdown-divider {
    height: 1px;
    background: var(--color-gray-100);
    margin: 4px 0;
}

/* --- Mobile Menu --- */
.mobile-menu-btn {
    display: none;
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--color-gray-600);
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover {
    background: var(--color-gray-100);
}

.mobile-nav {
    padding: 12px 0;
    border-top: 1px solid var(--color-gray-100);
    margin-top: 12px;
}

.mobile-nav-user {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--color-gray-800);
}

.mobile-nav-link {
    display: block;
    padding: 12px 0;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-50);
    transition: color var(--transition);
}

.mobile-nav-link:hover {
    color: var(--color-primary);
}

.mobile-nav-link-danger {
    color: var(--color-danger);
}

/* ============================================================
   Flash Messages / Alerts
   ============================================================ */
.flash-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.form-errors {
    padding: 0 32px;
}

.alert {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    transition: all 300ms ease;
}

.alert-success {
    background: var(--color-success-light);
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: var(--color-danger-light);
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: var(--color-warning-light);
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    opacity: 0.5;
    padding: 0 4px;
    line-height: 1;
    color: inherit;
}

.alert-close:hover {
    opacity: 1;
}

/* ============================================================
   Form Inputs (text, email, password)
   ============================================================ */
.form-input {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.form-input:hover {
    border-color: var(--color-gray-300);
    background-color: #fff;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    background-color: #fff;
}

.form-input::placeholder {
    color: var(--color-gray-400);
}

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

.form-row-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--color-gray-600);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-radio-group {
    display: flex;
    gap: 24px;
    padding: 8px 0;
}

.form-radio {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--color-text);
    cursor: pointer;
    padding: 8px 16px;
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    background: var(--color-surface);
}

.form-radio:hover {
    border-color: var(--color-primary-light);
    background: var(--color-primary-50);
}

.form-radio input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
    cursor: pointer;
    margin: 0;
}

.form-radio input[type="radio"]:checked + span {
    color: var(--color-primary);
    font-weight: 500;
}

.form-radio:has(input[type="radio"]:checked) {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
}

.form-actions {
    display: flex;
    gap: 12px;
    padding: 24px 32px 32px;
}

.inline-form {
    display: inline;
}

/* ============================================================
   Auth Pages (Login, Register, Forgot/Reset Password)
   ============================================================ */
.auth-page {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

.auth-card {
    width: 100%;
    max-width: 440px;
}

.auth-card-header {
    text-align: center;
    padding: 32px 32px 8px;
}

.auth-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background: var(--color-primary-50);
    color: var(--color-primary);
    border-radius: var(--radius-md);
}

.auth-card-wide {
    max-width: 540px;
}

.auth-form {
    padding: 20px 32px 28px;
}

.auth-form .form-group {
    margin-bottom: 16px;
}

.auth-form .form-label {
    text-transform: none;
    font-size: 0.88rem;
    letter-spacing: 0;
}

.auth-footer {
    text-align: center;
    padding: 16px 32px 28px;
    font-size: 0.88rem;
    color: var(--color-text-light);
}

.link {
    color: var(--color-primary);
    font-weight: 600;
    transition: color var(--transition);
}

.link:hover {
    color: var(--color-primary-dark);
}

.link-sm {
    font-size: 0.83rem;
}

/* --- Role Selector (Registration) --- */
.role-selector {
    display: flex;
    gap: 8px;
    padding: 0 32px;
    margin-bottom: 4px;
    margin-top: 8px;
}

.role-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--color-gray-500);
    background: var(--color-gray-50);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.role-option:hover {
    border-color: var(--color-gray-300);
    color: var(--color-gray-700);
    background: var(--color-gray-100);
}

.role-option-active {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-50);
}

.role-option-active:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-50);
}

/* --- Form Section Divider --- */
.form-section-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0 16px;
}

.form-section-divider::before,
.form-section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-gray-200);
}

.form-section-divider span {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

/* --- Optional label --- */
.label-optional {
    font-weight: 400;
    color: var(--color-gray-400);
    font-size: 0.8rem;
    text-transform: none;
    letter-spacing: 0;
}

/* ============================================================
   Teacher Pages - Classes & Students
   ============================================================ */

/* Suggest button (inline in form labels) */
.btn-suggest {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--color-primary);
    background: var(--color-primary-50);
    border: 1px solid var(--color-primary-light);
    border-radius: 100px;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: none;
    letter-spacing: 0;
    margin-left: 6px;
    vertical-align: middle;
}

.btn-suggest:hover {
    background: var(--color-primary-light);
}

/* Class checkbox grid (multi-select for class assignment) */
.class-checkbox-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 4px 0;
}

.class-checkbox-item {
    padding: 8px 14px;
    background: var(--color-gray-50);
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-size: 0.88rem;
}

.class-checkbox-item:hover {
    border-color: var(--color-gray-300);
    background: var(--color-surface);
}

.class-checkbox-item:has(input:checked) {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
    color: var(--color-primary);
}

@media (max-width: 480px) {
    .class-checkbox-grid {
        flex-direction: column;
    }

    .class-checkbox-item {
        width: 100%;
    }
}

/* ============================================================
   Page Headers (Profile, Children, History)
   ============================================================ */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-gray-900);
    letter-spacing: -0.01em;
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-top: 4px;
}

/* ============================================================
   Profile Page - Stats & Tabs
   ============================================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-100);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.stat-icon-purple {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.stat-icon-blue {
    background: #dbeafe;
    color: #2563eb;
}

.stat-icon-green {
    background: var(--color-success-light);
    color: var(--color-success);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-gray-900);
}

.stat-label {
    font-size: 0.78rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    padding: 4px;
}

.tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-gray-500);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.tab:hover {
    color: var(--color-gray-700);
}

.tab-active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.profile-form {
    padding: 24px 32px 8px;
}

.profile-form .form-group {
    margin-bottom: 18px;
}

.profile-form .form-label {
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.88rem;
}

/* ============================================================
   Children Page - Cards & Color Picker
   ============================================================ */
.children-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.child-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 24px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-100);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.child-card:hover {
    box-shadow: var(--shadow-md);
}

.child-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    flex-shrink: 0;
}

.child-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.child-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

.child-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

/* Color picker dots */
.color-picker {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    padding: 4px 0;
}

.color-dot-label {
    cursor: pointer;
}

.color-dot-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.color-dot {
    display: block;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid transparent;
    transition: all var(--transition);
}

.color-dot:hover {
    transform: scale(1.15);
}

.color-dot-input:checked + .color-dot {
    border-color: var(--color-gray-800);
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--color-gray-300);
    transform: scale(1.1);
}

/* ============================================================
   Empty State
   ============================================================ */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-light);
}

.empty-icon {
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: 6px;
}

.empty-state p {
    font-size: 0.9rem;
    max-width: 320px;
    margin: 0 auto;
}

/* ============================================================
   History Page - Filter & List
   ============================================================ */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-gray-500);
    white-space: nowrap;
}

.filter-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-gray-600);
    background: var(--color-gray-100);
    border-radius: 100px;
    transition: all var(--transition);
}

.chip:hover {
    background: var(--color-gray-200);
}

.chip-active {
    background: var(--color-primary);
    color: #fff;
}

.chip-active:hover {
    opacity: 0.9;
    background: var(--color-primary);
}

.history-list {
    padding: 4px 0;
}

.history-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 24px;
    transition: background var(--transition);
}

.history-row:hover {
    background: var(--color-gray-50);
}

.history-row-alt {
    background: var(--color-gray-50);
}

.history-main {
    display: flex;
    align-items: center;
    gap: 14px;
    flex: 1;
    min-width: 0;
}

.history-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.history-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.history-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-gray-800);
}

.history-child-name {
    font-weight: 400;
    color: var(--color-text-light);
}

.history-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.history-date {
    font-size: 0.78rem;
    color: var(--color-gray-400);
}

.history-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

/* ============================================================
   Responsive - New Components
   ============================================================ */

/* Tablets */
@media (max-width: 768px) {
    .nav-links .nav-link {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .user-menu {
        display: none;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .tabs {
        flex-direction: column;
    }

    .profile-form {
        padding: 20px 20px 8px;
    }

    .form-actions {
        padding: 20px 20px 24px;
    }

    .child-card {
        flex-wrap: wrap;
        padding: 16px 18px;
    }

    .child-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .history-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 14px 18px;
    }

    .history-actions {
        width: 100%;
    }

    .history-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .auth-card-wide {
        max-width: 100%;
    }

    .auth-form {
        padding: 16px 20px 24px;
    }

    .auth-card-header {
        padding: 24px 20px 8px;
    }

    .auth-footer {
        padding: 12px 20px 24px;
    }

    .form-errors {
        padding: 0 20px;
    }

    .role-selector {
        padding: 0 20px;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Small phones */
@media (max-width: 480px) {
    .child-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .color-dot {
        width: 28px;
        height: 28px;
    }

    .stat-card {
        padding: 14px 16px;
    }

    .stat-value {
        font-size: 1rem;
    }

    .history-meta .badge {
        padding: 3px 8px;
        font-size: 0.7rem;
    }
}

/* Large screens */
@media (min-width: 1024px) {
    .container-wide {
        max-width: 1020px;
    }
}

/* --- Print Styles --- */
@media print {
    .bg-decoration,
    .header,
    .footer,
    .worksheet-actions,
    .bottom-actions,
    .answers-card .btn-toggle,
    .flash-container {
        display: none !important;
    }

    body {
        background: #fff;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .answers-body {
        display: block !important;
    }

    .answers-body[hidden] {
        display: block !important;
    }
}

/* ============================================================
   Topic Selector (Multi-topic worksheet form)
   ============================================================ */
.topic-selector-hint {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 12px;
}

.topic-selector {
    display: flex;
    flex-direction: column;
    gap: 6px;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    padding: 8px;
    background: var(--color-gray-50);
}

.topic-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    background: var(--color-surface);
    transition: all var(--transition);
}

.topic-row:hover {
    border-color: var(--color-gray-200);
    background: var(--color-gray-50);
}

.topic-row-active {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
    box-shadow: 0 0 0 1px rgba(79, 70, 229, 0.1);
}

.topic-row-active:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-50);
}

.topic-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    flex: 1;
    min-width: 0;
    user-select: none;
}

.topic-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.topic-check-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: 2px solid var(--color-gray-300);
    background: var(--color-surface);
    color: transparent;
    flex-shrink: 0;
    transition: all var(--transition);
}

.topic-checkbox:checked ~ .topic-check-icon {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.topic-checkbox:focus-visible ~ .topic-check-icon {
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.topic-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--color-gray-100);
    color: var(--color-gray-500);
    flex-shrink: 0;
    transition: all var(--transition);
}

.topic-row-active .topic-icon {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.topic-name {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--color-gray-700);
    transition: color var(--transition);
}

.topic-row-active .topic-name {
    color: var(--color-primary-dark);
}

.topic-options {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.topic-difficulty,
.topic-count {
    appearance: none;
    -webkit-appearance: none;
    padding: 7px 28px 7px 10px;
    font-size: 0.82rem;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--color-gray-600);
    background-color: var(--color-gray-50);
    border: 1.5px solid var(--color-gray-200);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
    background-size: 14px;
}

.topic-difficulty:disabled,
.topic-count:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background-color: var(--color-gray-100);
}

.topic-difficulty:not(:disabled):hover,
.topic-count:not(:disabled):hover {
    border-color: var(--color-gray-300);
    background-color: #fff;
}

.topic-difficulty:not(:disabled):focus,
.topic-count:not(:disabled):focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.15);
    background-color: #fff;
}

.topic-difficulty {
    width: 110px;
}

.topic-count {
    width: 80px;
}

/* Section Headers on Worksheet Display */
.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px 12px;
    border-bottom: 2px solid var(--color-primary-light);
    margin-top: 4px;
}

.section-header:first-child {
    margin-top: 0;
}

.section-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.section-badges {
    display: flex;
    gap: 6px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    border-radius: 100px;
    letter-spacing: 0.02em;
}

/* Responsive - Topic Selector */
@media (max-width: 768px) {
    .topic-row {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 12px;
    }

    .topic-options {
        padding-left: 38px;
    }

    .topic-difficulty {
        flex: 1;
    }

    .topic-count {
        width: 90px;
    }

    .section-header {
        padding: 14px 20px 10px;
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
}

@media (max-width: 480px) {
    .topic-selector {
        padding: 6px;
    }

    .topic-row {
        padding: 10px;
    }

    .topic-options {
        padding-left: 0;
        flex-direction: column;
    }

    .topic-difficulty,
    .topic-count {
        width: 100%;
    }

    .topic-name {
        font-size: 0.85rem;
    }
}

/* ============================================================
   Timer Bar (Student Worksheet)
   ============================================================ */
.timer-bar {
    background: var(--color-surface);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    margin-bottom: 20px;
    position: sticky;
    top: 80px;
    z-index: 50;
    box-shadow: var(--shadow-md);
    transition: background var(--transition), border-color var(--transition);
}

.timer-bar-inner {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.timer-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text-light);
    white-space: nowrap;
}

.timer-countdown {
    font-size: 1.5rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--color-primary);
    min-width: 70px;
    text-align: center;
}

.timer-progress-wrap {
    flex: 1;
    min-width: 100px;
    height: 8px;
    background: var(--color-gray-100);
    border-radius: 4px;
    overflow: hidden;
}

.timer-progress {
    height: 100%;
    background: var(--color-primary);
    border-radius: 4px;
    transition: width 1s linear, background var(--transition);
}

.timer-bar.timer-warning {
    background: #fffbeb;
    border-color: #f59e0b;
}
.timer-bar.timer-warning .timer-countdown {
    color: #d97706;
}
.timer-bar.timer-warning .timer-progress {
    background: #f59e0b;
}

.timer-bar.timer-danger {
    background: #fef2f2;
    border-color: #ef4444;
    animation: timerPulse 1s ease-in-out infinite;
}
.timer-bar.timer-danger .timer-countdown {
    color: #dc2626;
}
.timer-bar.timer-danger .timer-progress {
    background: #ef4444;
}

@keyframes timerPulse {
    0%, 100% { box-shadow: var(--shadow-md); }
    50% { box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.15), var(--shadow-md); }
}

/* ============================================================
   Assignment Cards (Student Dashboard)
   ============================================================ */
.assignment-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.assignment-card {
    border-left: 4px solid var(--color-gray-300);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.assignment-card:hover {
    box-shadow: var(--shadow-lg);
}

.assignment-card-not-started {
    border-left-color: var(--color-gray-400);
}

.assignment-card-in-progress {
    border-left-color: #f59e0b;
}

.assignment-card-completed,
.assignment-card-can-retry {
    border-left-color: #059669;
}

.assignment-card-body {
    padding: 20px 24px;
}

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

.assignment-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0;
}

.assignment-card-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.assignment-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 16px;
    font-size: 0.88rem;
    color: var(--color-text-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.assignment-card-action {
    display: flex;
    justify-content: flex-end;
}

/* ============================================================
   Status Badges
   ============================================================ */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
}

.status-not-started {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

.status-in-progress {
    background: #fef3c7;
    color: #92400e;
}

.status-completed {
    background: #d1fae5;
    color: #065f46;
}

.status-can-retry {
    background: #dbeafe;
    color: #1e40af;
}

/* ============================================================
   Warning Button
   ============================================================ */
.btn-warning {
    background: #f59e0b;
    color: #fff;
    border: none;
}
.btn-warning:hover {
    background: #d97706;
}

/* ============================================================
   Progress Table (Teacher Assignment Detail)
   ============================================================ */
.progress-table-wrap {
    overflow-x: auto;
}

.progress-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.progress-table thead th {
    background: var(--color-gray-50);
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--color-text-light);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--color-gray-200);
    white-space: nowrap;
}

.progress-table tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-gray-100);
    vertical-align: middle;
}

.progress-table tbody tr:hover {
    background: var(--color-gray-50);
}

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

/* ============================================================
   Assignment Form Section Divider
   ============================================================ */
.form-section-divider {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-text-light);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-gray-200);
    margin-bottom: 16px;
    margin-top: 24px;
}

/* ============================================================
   Responsive: Timer + Assignment Cards
   ============================================================ */
@media (max-width: 768px) {
    .timer-bar {
        top: 70px;
        padding: 10px 14px;
    }

    .timer-bar-inner {
        gap: 10px;
    }

    .timer-countdown {
        font-size: 1.2rem;
    }

    .assignment-card-body {
        padding: 16px;
    }

    .assignment-card-meta {
        gap: 12px;
    }

    .progress-table thead th,
    .progress-table tbody td {
        padding: 10px 12px;
        font-size: 0.84rem;
    }
}

@media (max-width: 480px) {
    .timer-bar-inner {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .timer-label {
        justify-content: center;
    }

    .timer-countdown {
        text-align: center;
        font-size: 1.8rem;
    }

    .assignment-card-header {
        flex-direction: column;
    }

    .assignment-card-action {
        justify-content: stretch;
    }

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

/* ===== Student Profile Page ===== */

.student-profile-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 28px;
}

.student-profile-avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: #059669;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.student-profile-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.student-profile-meta {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 2px;
}

/* Star collection grid */
.star-collection {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.star-collection-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-100);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition);
}

.star-collection-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.star-collection-icon {
    font-size: 2rem;
    margin-bottom: 4px;
    line-height: 1;
}

.star-collection-count {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1.2;
}

.star-collection-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-top: 2px;
}

/* Topic mastery rows */
.topic-mastery-row {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-gray-100);
}

.topic-mastery-row:last-child {
    border-bottom: none;
}

.topic-mastery-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.topic-mastery-info {
    flex: 1;
    min-width: 0;
}

.topic-mastery-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.topic-mastery-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

.topic-mastery-bar {
    height: 8px;
    background: var(--color-gray-100);
    border-radius: 4px;
    overflow: hidden;
}

.topic-mastery-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.8s ease-out;
}

.topic-mastery-subtitle {
    font-size: 0.78rem;
    color: var(--color-text-light);
    margin-top: 4px;
}

/* Level badges */
.level-badge {
    display: inline-flex;
    padding: 2px 10px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

.level-beginner {
    background: #fee2e2;
    color: #dc2626;
}

.level-intermediate {
    background: #fef3c7;
    color: #d97706;
}

.level-advanced {
    background: #dbeafe;
    color: #2563eb;
}

.level-master {
    background: #d1fae5;
    color: #059669;
}

/* Student profile responsive */
@media (max-width: 768px) {
    .student-profile-header {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .star-collection {
        grid-template-columns: 1fr;
    }

    .topic-mastery-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

/* ===== Teacher Dashboard ===== */

.feature-icon-amber {
    background: #fef3c7;
    color: #d97706;
}

@media (max-width: 900px) {
    .dashboard-page .features {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 600px) {
    .dashboard-page .features {
        grid-template-columns: 1fr !important;
    }
}

/* ============================================================
   Landing Page (Role Selection)
   ============================================================ */
.landing-hero {
    text-align: center;
    padding: 10px 0 32px;
}

.landing-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--color-primary-light);
    color: var(--color-primary);
    margin-bottom: 16px;
}

.landing-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.landing-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.6;
}

.landing-roles {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 780px;
    margin: 0 auto 20px;
}

.role-card {
    background: var(--color-surface);
    border: 1px solid var(--color-gray-100);
    border-top: 4px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.role-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.role-card-teacher { border-top-color: var(--color-primary); }
.role-card-parent  { border-top-color: #3b82f6; }
.role-card-student { border-top-color: var(--color-success); }
.role-card-guest   { border-top-color: var(--color-gray-400); }

.role-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    margin-bottom: 14px;
}

.role-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.role-card-desc {
    font-size: 0.88rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin-bottom: 18px;
    min-height: 42px;
}

.role-card-actions {
    display: flex;
    gap: 8px;
    width: 100%;
    justify-content: center;
}

.role-card-actions .btn {
    flex: 1;
    justify-content: center;
    max-width: 140px;
}

.role-card-note {
    font-size: 0.75rem;
    color: var(--color-gray-400);
    margin-top: 10px;
    font-style: italic;
}

@media (max-width: 640px) {
    .landing-roles {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .landing-title {
        font-size: 1.7rem;
    }

    .landing-subtitle {
        font-size: 0.95rem;
    }

    .role-card {
        padding: 22px 20px;
    }

    .role-card-desc {
        min-height: auto;
    }
}

/* ============================================================
   Parent Dashboard
   ============================================================ */
.parent-children-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 16px;
    padding: 20px 24px;
}

.child-overview-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 16px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-100);
    background: var(--color-gray-50);
    text-align: center;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition);
}

.child-overview-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    background: var(--color-surface);
}

.child-overview-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.child-overview-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 6px;
}

.child-overview-meta {
    margin-bottom: 6px;
}

.child-overview-stat {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

@media (max-width: 480px) {
    .parent-children-grid {
        grid-template-columns: repeat(2, 1fr);
        padding: 16px;
        gap: 12px;
    }

    .child-overview-card {
        padding: 16px 12px;
    }
}