@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --bg-page: #f5f0ff;
    --bg-panel: #ffffff;
    --bg-surface: #f0ecff;
    --bg-highlight: #ede7ff;
    --bg-hint: #fff8e1;
    --border-hint: #ffe082;
    --hint-text: #5d4037;
    --text-main: #1e1b3a;
    --text-secondary: #6b6490;
    --text-on-primary: #ffffff;
    --border-color: #d5d0e8;
    --border-color-light: #e4dfef;
    --border-color-hover: #b0a8d0;
    --primary-color: #7c3aed;
    --primary-hover: #6d28d9;
    --primary-light: #ede9fe;
    --focus-ring: rgba(124, 58, 237, 0.25);
    --correct: #059669;
    --correct-bg: #d1fae5;
    --incorrect: #dc2626;
    --incorrect-bg: #fee2e2;
    --incorrect-bg-light: #fef2f2;
    --warning: #d97706;
    --shadow-sm: rgba(124, 58, 237, 0.04);
    --shadow-md: rgba(124, 58, 237, 0.08);
    --shadow-lg: rgba(124, 58, 237, 0.15);
    --shadow-overlay: rgba(15, 10, 40, 0.85);
    --hamburger-hover: #f0ecff;
    --progress-gradient-end: #a78bfa;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-full: 9999px;
    --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-page: #0f0a1e;
        --bg-panel: #1a1230;
        --bg-surface: #221842;
        --bg-highlight: #2d1f5e;
        --bg-hint: #2d2a1a;
        --border-hint: #5d5020;
        --hint-text: #d4c99a;
        --text-main: #e8e4f0;
        --text-secondary: #a59cc0;
        --text-on-primary: #ffffff;
        --border-color: #3d2d6b;
        --border-color-light: #2e2255;
        --border-color-hover: #6a55a0;
        --primary-color: #a78bfa;
        --primary-hover: #c4b5fd;
        --primary-light: #2d1f5e;
        --focus-ring: rgba(167, 139, 250, 0.35);
        --correct: #34d399;
        --correct-bg: #1a2e28;
        --incorrect: #f87171;
        --incorrect-bg: #2e1a1a;
        --incorrect-bg-light: #251515;
        --warning: #fbbf24;
        --shadow-sm: rgba(0, 0, 0, 0.3);
        --shadow-md: rgba(0, 0, 0, 0.4);
        --shadow-lg: rgba(0, 0, 0, 0.5);
        --shadow-overlay: rgba(5, 2, 15, 0.92);
        --hamburger-hover: #221842;
        --progress-gradient-end: #c4b5fd;
        --calendar-icon-filter: invert(0.8);
    }
}

[data-theme="dark"] {
    --bg-page: #0f0a1e;
    --bg-panel: #1a1230;
    --bg-surface: #221842;
    --bg-highlight: #2d1f5e;
    --bg-hint: #2d2a1a;
    --border-hint: #5d5020;
    --hint-text: #d4c99a;
    --text-main: #e8e4f0;
    --text-secondary: #a59cc0;
    --text-on-primary: #ffffff;
    --border-color: #3d2d6b;
    --border-color-light: #2e2255;
    --border-color-hover: #6a55a0;
    --primary-color: #a78bfa;
    --primary-hover: #c4b5fd;
    --primary-light: #2d1f5e;
    --focus-ring: rgba(167, 139, 250, 0.35);
    --correct: #34d399;
    --correct-bg: #1a2e28;
    --incorrect: #f87171;
    --incorrect-bg: #2e1a1a;
    --incorrect-bg-light: #251515;
    --warning: #fbbf24;
    --shadow-sm: rgba(0, 0, 0, 0.3);
    --shadow-md: rgba(0, 0, 0, 0.4);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    --shadow-overlay: rgba(5, 2, 15, 0.92);
    --hamburger-hover: #221842;
    --progress-gradient-end: #c4b5fd;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

header {
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 40%, #4f46e5 100%);
    color: var(--text-on-primary);
    padding: 0.85rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: none;
    box-shadow: 0 2px 12px rgba(124, 58, 237, 0.25);
    flex-wrap: wrap;
    gap: 0.5rem;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.session-id {
    font-size: 0.85rem;
    font-family: monospace;
    color: var(--primary-light);
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    position: relative;
}

html, body {
    min-height: 100vh;
    background-color: var(--bg-panel);
}

.panel {
    background: var(--bg-panel);
    padding: 2rem;
    border: 1px solid var(--border-color-light);
    border-top: none;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.06);
    border-radius: var(--radius-lg);
}

#view-admin {
    padding: 1.25rem;
}

.hidden {
    display: none !important;
}

h2 {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 800;
    letter-spacing: -0.01em;
}

p.instructions {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.btn {
    background: linear-gradient(135deg, var(--primary-color), #6d28d9);
    color: white;
    border: none;
    padding: 0.75rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-full);
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.2);
    letter-spacing: 0.01em;
    font-family: var(--font-main);
}

.btn:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-hover), #5b21b6);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.35);
    transform: translateY(-2px);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(124, 58, 237, 0.15);
}

.btn:disabled {
    background: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    box-shadow: none;
}

.grid-select {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.btn-outline,
.option-item {
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-color);
    background: var(--bg-panel);
    cursor: pointer;
    font-size: 1rem;
    font-family: var(--font-main);
    color: var(--text-main);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.btn-outline {
    text-align: center;
    font-weight: 600;
}

.option-item {
    text-align: left;
}

.btn-outline:hover,
.option-item:hover:not(:disabled) {
    background: var(--bg-surface);
    border-color: var(--border-color-hover);
}

.btn-outline:active,
.btn-outline:focus,
.option-item.selected {
    border-color: var(--primary-color);
    background: var(--bg-highlight);
    box-shadow: 0 0 0 2px var(--focus-ring);
    outline: none;
}

.text-input {
    width: 100%;
    padding: 0.85rem 1.15rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: var(--font-main);
    color: var(--text-main);
    background: var(--bg-panel);
    transition: all var(--transition-base);
    margin-bottom: 2rem;
}

.text-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.text-input[type="date"]::-webkit-calendar-picker-indicator {
    filter: var(--calendar-icon-filter, none);
    cursor: pointer;
}

.text-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
    outline: none;
}

.text-input.state-correct {
    border-color: var(--correct);
    background-color: var(--correct-bg);
    color: var(--correct);
    font-weight: bold;
}

.text-input.state-incorrect {
    border-color: var(--incorrect);
    background-color: var(--incorrect-bg);
    color: var(--incorrect);
    text-decoration: line-through;
    opacity: 0.8;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.question-block {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    color: var(--text-main);
    line-height: 1.6;
}

.graph-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

canvas {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.option-item.state-correct {
    border-color: var(--correct);
    background: var(--correct-bg);
    color: var(--correct);
    font-weight: 600;
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

.option-item.state-incorrect {
    border-color: var(--incorrect);
    background: var(--incorrect-bg);
    color: var(--incorrect);
    text-decoration: line-through;
    opacity: 0.8;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.rationale-panel {
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
    background: var(--bg-surface);
}

.rationale-panel.error {
    border-color: var(--incorrect);
}

.rationale-panel.success {
    border-color: var(--correct);
}

.rationale-header {
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.rationale-text {
    font-size: 0.95rem;
    color: var(--text-main);
}

.queue-notice {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--incorrect);
    font-weight: 600;
}

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 1.5rem 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-color-light);
}

.data-table th,
.data-table td {
    border: none;
    border-bottom: 1px solid var(--border-color-light);
    padding: 0.75rem 1rem;
    text-align: left;
}

.data-table th {
    background: var(--bg-surface);
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.metric-value {
    font-family: monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--shadow-overlay);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-box {
    background: var(--bg-panel);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    max-width: 500px;
    text-align: center;
    border-top: none;
    box-shadow: 0 20px 60px rgba(124, 58, 237, 0.2);
    animation: slideUp 0.25s ease;
}

.modal-box::before {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    border-radius: var(--radius-full);
    margin: 0 auto 1.25rem;
    background: var(--warning);
}

.modal-box h3 {
    color: var(--warning);
    margin-bottom: 1rem;
}

.modal-box p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

/* ========== HAMBURGER MENU ========== */
/* ========== SIDEBAR ========== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 220px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border-color-light);
    display: flex;
    flex-direction: column;
    z-index: 600;
    box-shadow: 4px 0 20px rgba(124, 58, 237, 0.06);
}

.sidebar.hidden {
    display: none !important;
}

.sidebar-profile {
    padding: 1.25rem 1rem;
    border-bottom: none;
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 40%, #4f46e5 100%);
    color: #fff;
}

.sidebar-profile-name {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.15rem;
}

.sidebar-profile-detail {
    font-size: 0.8rem;
    opacity: 0.85;
}

.sidebar-nav {
    flex: 1;
    padding: 0.5rem 0;
    overflow-y: auto;
}

.sidebar-item {
    display: block;
    width: calc(100% - 8px);
    padding: 0.7rem 1.25rem;
    background: none;
    border: none;
    border-left: 3px solid transparent;
    text-align: left;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-main);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: inherit;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 2px 8px 2px 0;
}

.sidebar-item:hover {
    background: var(--hamburger-hover, #f0f0f0);
    transform: translateX(2px);
}

.sidebar-item.active {
    color: var(--primary-color);
    background: var(--bg-highlight, #e6f2ff);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

.sidebar-bottom {
    border-top: 1px solid var(--border-color);
    padding: 0.5rem 0;
}

.sidebar-signout {
    color: var(--incorrect) !important;
}

/* Push content to the right when sidebar is visible */
.has-sidebar header {
    margin-left: 220px;
}

.has-sidebar .container {
    margin-left: 220px;
}

/* Mobile toggle button — hidden on desktop */
.sidebar-toggle {
    display: none;
}

/* Sidebar backdrop — hidden on desktop */
.sidebar-backdrop {
    display: none;
}

@media (max-width: 768px) {
    /* Show hamburger toggle in header */
    .sidebar-toggle {
        display: flex;
        flex-direction: column;
        gap: 4px;
        background: none;
        border: 2px solid rgba(255, 255, 255, 0.5);
        border-radius: var(--radius-sm);
        padding: 6px 8px;
        cursor: pointer;
    }
    .sidebar-toggle:hover {
        border-color: #fff;
    }
    .sidebar-toggle span {
        display: block;
        width: 20px;
        height: 2px;
        background: #fff;
        border-radius: 1px;
    }

    /* Sidebar: overlay instead of push, hidden by default via transform */
    .sidebar {
        width: 240px;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        box-shadow: 4px 0 16px rgba(0,0,0,0.2);
    }

    /* Override .sidebar.hidden for mobile — use transform not display:none */
    .sidebar.hidden {
        display: flex !important;
        transform: translateX(-100%);
    }

    /* When sidebar is open on mobile */
    .sidebar.mobile-open {
        transform: translateX(0);
    }

    /* No margin push on mobile — sidebar overlays */
    .has-sidebar header,
    .has-sidebar .container {
        margin-left: 0;
    }

    /* Backdrop overlay when sidebar is open */
    .sidebar-backdrop.visible {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 599;
    }
}

/* ========== HAMBURGER (kept for admin) ========== */

.hamburger-wrap {
    position: relative;
}

.hamburger-btn {
    background: none;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: border-color 0.2s;
}

.hamburger-btn:hover {
    border-color: var(--text-on-primary);
}

.hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-on-primary);
    border-radius: 1px;
}

.hamburger-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 16px var(--shadow-lg);
    min-width: 180px;
    z-index: 500;
    overflow: hidden;
}

.hamburger-item {
    display: block;
    width: 100%;
    padding: 0.75rem 1.25rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    transition: background 0.15s;
    font-family: inherit;
}

.hamburger-item:hover {
    background: var(--hamburger-hover);
}

.hamburger-item.active {
    color: var(--primary-color);
    background: var(--bg-highlight);
    border-left: 3px solid var(--primary-color);
}

/* ========== LOADING & VALIDATION SCREEN ========== */

.loading-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--shadow-overlay);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease;
}

.loading-modal.hidden {
    display: none;
}

.loading-content {
    background: var(--bg-panel);
    border-radius: var(--radius-md);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: 0 4px 20px var(--shadow-md);
    min-width: 0;
    width: 90vw;
    max-width: 320px;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel:not(.hidden) {
    animation: fadeIn 0.25s ease;
}

.loading-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.loading-message {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.loading-progress {
    width: 100%;
    height: 6px;
    background: var(--bg-page);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #7c3aed, #a78bfa, #c4b5fd);
    width: 0%;
    transition: width 0.1s linear;
    border-radius: var(--radius-full);
}

.loading-time {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* ========== MATH SYMBOL GRID DROPDOWN ========== */
.math-input-wrap {
    position: relative;
}

.math-input-wrap .text-input {
    padding-right: 3rem;
}

.math-grid-toggle {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 36px;
    height: 36px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.15s;
}

.math-grid-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.math-grid-dropdown {
    position: absolute;
    top: calc(100% - 1.5rem);
    right: 0;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px var(--shadow-md);
    padding: 0.5rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.35rem;
    z-index: 100;
    min-width: 0;
    width: 200px;
    max-width: 90vw;
}

.math-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border-color-light);
    color: var(--text-main);
    padding: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.15s;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

/* ========== LOGIN FORM ========== */

#view-login,
#view-forgot,
#view-register,
#view-pending {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 56px);
    text-align: center;
}

#view-login .login-form,
#view-forgot .login-form,
#view-register .login-form {
    margin: 0 auto;
    text-align: left;
}

.login-form {
    max-width: 420px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-form .text-input {
    margin-bottom: 0;
}

.login-form select.text-input {
    cursor: pointer;
    height: auto;
    padding: 0.75rem 1rem;
}

/* ========== ADMIN PANEL (DASHBOARD LAYOUT) ========== */
.admin-dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.admin-dashboard-grid .admin-section.full-width {
    grid-column: 1 / -1;
}

.admin-section {
    margin-bottom: 0;
    padding: 1.25rem;
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-lg);
    background: var(--bg-panel);
    box-shadow: 0 2px 12px var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.admin-section-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border-color-light);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

summary.admin-section-title {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.section-badge {
    display: inline-block;
    background: var(--incorrect);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.1rem 0.45rem;
    border-radius: var(--radius-full);
    min-width: 18px;
    text-align: center;
    vertical-align: middle;
    margin-left: 0.35rem;
}

.admin-form {
    max-width: 100%;
}

.admin-form-row {
    margin-bottom: 0.85rem;
}

.admin-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.35rem;
}

.admin-form select.text-input {
    cursor: pointer;
    height: auto;
    padding: 0.6rem 0.85rem;
    font-size: 0.9rem;
}

.admin-form .text-input {
    padding: 0.6rem 0.85rem;
    font-size: 0.9rem;
    margin-bottom: 0.85rem;
}


/* ========== CUSTOM TEST CREATOR ========== */
/* ========== CHECKBOX LABELS ========== */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-main);
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 15px;
    height: 15px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* ========== GRADE SUMMARY CARDS ========== */
.scores-section-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.grade-summary-card {
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin-bottom: 0.75rem;
    background: var(--bg-surface);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.grade-summary-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

.grade-summary-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--primary-color);
}

.grade-summary-stats {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.grade-summary-body {
    font-size: 0.875rem;
    color: var(--text-main);
    line-height: 1.55;
    margin-bottom: 0.75rem;
}

.grade-ai-btn {
    background: none;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.15s;
}

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

/* ========== STUDENT DETAIL PANEL ========== */
.student-detail-panel {
    border-top: 2px solid var(--primary-color);
    background: var(--bg-surface);
}

.student-ai-summary {
    padding: 0.65rem 0.85rem;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-main);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.wrong-answers-list {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.wrong-answer-item {
    padding: 0.5rem 0.75rem;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
}

.wrong-q {
    color: var(--text-main);
    margin-bottom: 0.2rem;
    font-size: 0.85rem;
}

.wrong-meta { color: var(--text-secondary); }
.wrong-bad  { color: var(--incorrect); font-weight: 700; }
.wrong-good { color: var(--correct);   font-weight: 700; }

/* ========== TERMINATED BADGE ========== */
.terminated-badge {
    display: inline-block;
    background: var(--incorrect-bg);
    color: var(--incorrect);
    border: 1px solid var(--incorrect);
    padding: 0.15rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
}

.format-hint-dropdown {
    margin-bottom: 0.5rem;
}

.format-hint-toggle {
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
    padding: 0.4rem 0;
    user-select: none;
}

.format-hint-toggle:hover {
    text-decoration: underline;
}

.format-hint {
    background: var(--bg-hint);
    border: 1px solid var(--border-hint);
    border-left: 4px solid var(--warning);
    padding: 0.85rem 1rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    line-height: 1.7;
    margin-top: 0.4rem;
}

.format-hint strong {
    color: var(--text-main);
}

.custom-textarea {
    width: 100%;
    min-height: 180px;
    padding: 1rem;
    font-size: 0.95rem;
    font-family: inherit;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    background: var(--bg-panel);
    resize: vertical;
    line-height: 1.6;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.custom-textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
    outline: none;
}

.process-status {
    font-size: 0.9rem;
    font-weight: 600;
}

.process-status.processing { color: var(--warning); }
.process-status.done       { color: var(--correct); }
.process-status.error      { color: var(--incorrect); }

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.preview-invalid-count {
    color: var(--incorrect);
}

.preview-valid-count {
    color: var(--correct);
}

.apply-corrections-btn {
    width: 100%;
    padding: 0.65rem;
    background: var(--correct);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 0.75rem;
    transition: opacity 0.15s;
}

.apply-corrections-btn:hover {
    opacity: 0.88;
}

.invalid-answer-card {
    border-left-color: var(--incorrect) !important;
    background: var(--incorrect-bg-light) !important;
}

.answer-error-banner {
    background: var(--incorrect-bg);
    color: var(--incorrect);
    border: 1px solid var(--incorrect);
    border-radius: var(--radius-sm);
    padding: 0.45rem 0.75rem;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.custom-question-card {
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    padding: 0.9rem 1rem;
    margin-bottom: 0.6rem;
    background: var(--bg-surface);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.custom-q-num {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--primary-color);
    letter-spacing: 0.5px;
    margin-bottom: 0.35rem;
}

.custom-q-text {
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 0.35rem;
}

.custom-q-answer {
    font-size: 0.85rem;
    color: var(--correct);
}

.custom-q-options {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

/* Math formatting */
.mfrac {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    vertical-align: middle;
    margin: 0 0.2em;
    font-size: 1em;
    line-height: 1.2;
    text-align: center;
}

.mfrac-num {
    border-bottom: 2px solid currentColor;
    padding: 0.05em 0.35em 0.15em;
    min-width: 0.8em;
}

.mfrac-den {
    padding: 0.15em 0.35em 0.05em;
    min-width: 0.8em;
}

.option-item .mfrac,
.question-block .mfrac {
    font-size: 1em;
}

/* Square root — single connected element using scaled √ character */
.msqrt {
    display: inline-flex;
    align-items: stretch;
    vertical-align: middle;
    margin: 0 0.1em;
    white-space: nowrap;
}

.msqrt::before {
    content: '\221A';  /* √ */
    display: inline-block;
    font-size: 1.3em;
    line-height: 0.9;
    transform: scaleY(1.05);
    transform-origin: bottom left;
    vertical-align: bottom;
}

.msqrt-inner {
    display: inline-block;
    border-top: 2px solid currentColor;
    padding: 0 0.2em 0 0.08em;
    margin-left: -0.05em;
    line-height: 1.3;
}

.option-item sup,
.question-block sup {
    font-size: 0.75em;
    vertical-align: super;
    line-height: 0;
}

/* Hint area */
.hint-toggle {
    background: none;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: background 0.15s, color 0.15s;
}

.hint-toggle:hover {
    border-color: var(--primary-hover);
    color: var(--primary-hover);
    text-decoration: underline;
}

.hint-content {
    background: var(--bg-hint);
    border: 1px solid var(--border-hint);
    border-radius: var(--radius-sm);
    padding: 0.7rem 1rem;
    margin-top: 0.75rem;
    font-size: 0.88rem;
    color: var(--hint-text);
    line-height: 1.4;
}

/* ========== THEME TOGGLE ========== */
.theme-toggle-btn {
    background: none;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    transition: border-color 0.2s;
    color: var(--text-on-primary);
}

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

/* ========== APP MODAL (replaces alert/confirm) ========== */
.modal-box.modal-error::before { background: var(--incorrect); }
.modal-box.modal-error h3 { color: var(--incorrect); }
.modal-box.modal-success::before { background: var(--correct); }
.modal-box.modal-success h3 { color: var(--correct); }
.modal-box.modal-confirm::before { background: var(--warning); }
.modal-box.modal-info::before { background: var(--primary-color); }
.modal-box.modal-info h3 { color: var(--primary-color); }

.modal-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.modal-actions .btn { min-width: 100px; }

.btn-cancel {
    background: var(--bg-surface);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.btn-cancel:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

/* ========== SPINNER ========== */
.spinner {
    width: 36px;
    height: 36px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1rem;
}

.spinner-inline {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== TIMER WARNING ========== */
.timer-warning {
    animation: timerPulse 1s ease-in-out infinite;
}

@keyframes timerPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ========== QUESTION MAP & NAVIGATION ========== */
.question-map {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 1rem;
    padding: 0.5rem;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.qmap-item {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    background: var(--bg-panel);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.qmap-item:hover { border-color: var(--primary-color); }
.qmap-item.qmap-current { border-color: var(--primary-color); box-shadow: 0 0 0 2px var(--focus-ring); }
.qmap-item.qmap-correct { background: var(--correct-bg); color: var(--correct); border-color: var(--correct); }
.qmap-item.qmap-incorrect { background: var(--incorrect-bg); color: var(--incorrect); border-color: var(--incorrect); }
.qmap-item.qmap-flagged { position: relative; border-color: var(--warning); }
.qmap-item.qmap-flagged::after {
    content: '';
    position: absolute;
    top: -2px;
    right: -2px;
    width: 6px;
    height: 6px;
    background: var(--warning);
    border-radius: 50%;
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.nav-left, .nav-right { display: flex; gap: 0.5rem; align-items: center; }

.btn-nav {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-secondary);
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.15s;
}

.btn-nav:hover { border-color: var(--primary-color); color: var(--primary-color); }
.btn-nav.flagged { color: var(--warning); border-color: var(--warning); }

/* ========== TEST SETTINGS ========== */
.settings-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 500px;
}

.settings-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    cursor: pointer;
    transition: border-color 0.15s;
}

.settings-item:hover { border-color: var(--primary-color); }

.settings-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--primary-color);
    cursor: pointer;
    flex-shrink: 0;
}

.settings-item strong {
    display: block;
    font-size: 0.9rem;
    color: var(--text-main);
}

.settings-desc {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.15rem;
    line-height: 1.4;
}

/* ========== TEST SETTINGS POPUP (in-test) ========== */
.test-settings-wrap {
    position: relative;
}

.test-settings-popup {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px var(--shadow-lg);
    padding: 0.5rem 0.75rem;
    z-index: 200;
    min-width: 160px;
}

.test-settings-popup label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    white-space: nowrap;
}

.test-settings-popup input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* ========== TEST PROGRESS BAR ========== */
.test-progress-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.test-progress-track {
    flex: 1;
    height: 8px;
    background: var(--bg-surface);
    border-radius: var(--radius-full);
    overflow: hidden;
    border: none;
}

.test-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #7c3aed, #a78bfa, #c4b5fd);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.4s ease;
}

.test-progress-pct {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: right;
}

/* ========== MISCONCEPTIONS PANEL ========== */
.misconceptions-panel {
    margin-top: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    background: var(--incorrect-bg-light);
    border: 1px solid var(--incorrect);
}
.misconceptions-panel h4 { font-size: 0.85rem; }
.misconceptions-panel .data-table { font-size: 0.85rem; margin: 0.5rem 0 0; }
.misconceptions-panel .data-table td,
.misconceptions-panel .data-table th { padding: 0.4rem 0.6rem; }

/* ========== DUE DATE BADGES ========== */
.due-badge { font-weight: 600; }
.due-ok { color: var(--correct); }
.due-soon, .due-tomorrow { color: var(--warning); }
.due-today, .due-overdue { color: var(--incorrect); font-weight: 700; }

/* ========== STUDENT PROGRESS DASHBOARD ========== */
.progress-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.progress-stat-card {
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    text-align: center;
    background: var(--bg-surface);
    box-shadow: 0 2px 10px rgba(124, 58, 237, 0.06);
}

.progress-stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.progress-stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 0.25rem;
}

.progress-bar-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.4rem;
}

.progress-bar-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    min-width: 80px;
    text-align: right;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.progress-bar-track {
    flex: 1;
    height: 18px;
    background: var(--bg-surface);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.progress-bar-pct {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-main);
    min-width: 36px;
}

/* ========== LOGIN NAME ROW ========== */
.login-name-row {
    display: flex;
    gap: 0.75rem;
}

/* ========== RESPONSIVE BREAKPOINTS ========== */

@media (max-width: 768px) {
    /* Layout — single column */
    .admin-dashboard-grid { grid-template-columns: 1fr; }
    .grid-select { grid-template-columns: repeat(2, 1fr); }
    .login-form { max-width: 100%; }
    .login-name-row { flex-direction: column; }

    /* Reduce padding */
    header { padding: 0.75rem 1.25rem; }
    .panel { padding: 1.25rem; }
    #view-admin { padding: 1rem; }

    /* Touch targets — 44px minimum */
    .btn { padding: 0.8rem 1.5rem; min-height: 44px; }
    .btn-nav { padding: 0.55rem 0.9rem; min-height: 44px; font-size: 0.85rem; }
    .hint-toggle { padding: 0.6rem 1rem; min-height: 44px; }
    .qmap-item { width: 38px; height: 38px; font-size: 0.8rem; }
    .option-item { padding: 0.85rem 1rem; min-height: 44px; }

    /* Prevent iOS auto-zoom on input focus */
    .text-input, .custom-textarea { font-size: 16px; }

    /* Tables scroll */
    .data-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .data-table th, .data-table td { white-space: nowrap; }

    /* Modals */
    .modal-box { max-width: 92vw; padding: 1.5rem; }
    .loading-content { min-width: auto; width: 90vw; padding: 2rem 1.5rem; }

    /* Question spacing */
    .question-block { margin-bottom: 1.25rem; }
    .options-list { gap: 0.5rem; margin-bottom: 1.25rem; }

    /* Status bar stacks on mobile */
    .status-bar { flex-wrap: wrap; gap: 0.3rem; font-size: 0.8rem; }

    /* Math rendering — slightly larger for readability */
    .mfrac { font-size: 1em; }
    .option-item sup, .question-block sup { font-size: 0.8em; }

    /* Results */
    #res-score-big { font-size: 2.25rem !important; }

    /* Login centering — reduce min-height for keyboard */
    #view-login, #view-forgot, #view-register, #view-pending {
        min-height: auto;
        padding-top: 2rem;
        padding-bottom: 2rem;
    }
}

@media (max-width: 480px) {
    header { padding: 0.6rem 1rem; }
    header h1 { font-size: 1.05rem; }
    .panel { padding: 1rem; }

    .grid-select { grid-template-columns: 1fr; }
    .progress-cards { grid-template-columns: 1fr; }

    .qmap-item { width: 34px; height: 34px; font-size: 0.75rem; }

    /* Nav buttons stack better */
    .nav-bar { gap: 0.4rem; }

    /* Sidebar narrower on tiny phones */
    .sidebar { width: 200px; }
}

@media (max-width: 360px) {
    .panel { padding: 0.75rem; }
    .sidebar { width: 170px; }
    .btn { padding: 0.7rem 1rem; font-size: 0.85rem; }
    .question-block { font-size: 1rem; }
}

/* ========== PRINT STYLES ========== */
@media print {
    header, .sidebar, .sidebar-backdrop, .no-print, #offline-banner { display: none !important; }
    body { margin: 0; background: #fff; }
    .has-sidebar .container { margin-left: 0; }
    .container { max-width: 100%; padding: 0; }
    .panel { border: none; box-shadow: none; padding: 1rem; min-height: auto; }
    #view-results { display: block !important; }
    #results-report { max-width: 600px; margin: 0 auto; }
    .data-table { font-size: 0.85rem; }
    .data-table th, .data-table td { padding: 0.4rem 0.6rem; }
}