/* =========================================
   STUDENT QUIZ WEBSITE
   Main Stylesheet
   ========================================= */

:root {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --primary-light: #ede9fe;

    --background: #f7f7fb;
    --surface: #ffffff;
    --surface-2: #f3f4f6;

    --text: #171717;
    --text-light: #6b7280;
    --border: #e5e7eb;

    --success: #16a34a;
    --success-light: #dcfce7;

    --danger: #dc2626;
    --danger-light: #fee2e2;

    --warning: #d97706;
    --warning-light: #fef3c7;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.12);

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

    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;

    transition:
        background var(--transition),
        color var(--transition);
}

button {
    font: inherit;
    cursor: pointer;
    border: none;
}

button:focus-visible {
    outline: 3px solid var(--primary-light);
    outline-offset: 2px;
}

.hidden {
    display: none !important;
}


/* =========================================
   HEADER
   ========================================= */

.header {
    height: 72px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);

    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 0 5%;

    position: sticky;
    top: 0;
    z-index: 100;

    transition:
        background var(--transition),
        border-color var(--transition);
}

.logo {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary);

    white-space: nowrap;
}

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

.icon-btn {
    width: 42px;
    height: 42px;

    display: flex;
    align-items: center;
    justify-content: center;

    background: var(--surface-2);
    border-radius: 50%;

    transition:
        transform var(--transition),
        background var(--transition);
}

.icon-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-light);
}


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

.app-container {
    width: min(1200px, 92%);
    margin: 0 auto;
    padding: 40px 0 70px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}


/* =========================================
   HERO
   ========================================= */

.hero {
    min-height: 390px;

    display: flex;
    align-items: center;
    justify-content: center;

    text-align: center;

    padding: 60px 25px;

    border-radius: var(--radius-lg);

    background:
        linear-gradient(
            135deg,
            var(--primary-light),
            var(--surface)
        );

    box-shadow: var(--shadow-sm);

    margin-bottom: 55px;
}

.hero-content {
    max-width: 720px;
}

.hero-badge {
    display: inline-block;

    padding: 7px 14px;
    margin-bottom: 18px;

    background: var(--surface);
    color: var(--primary);

    border-radius: 999px;

    font-size: 13px;
    font-weight: 700;

    box-shadow: var(--shadow-sm);
}

.hero h1 {
    font-size: clamp(38px, 6vw, 64px);
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -2px;
}

.hero p {
    color: var(--text-light);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto 30px;
}


/* =========================================
   BUTTONS
   ========================================= */

.primary-btn,
.secondary-btn,
.submit-btn,
.danger-btn,
.back-btn {
    min-height: 44px;

    padding: 11px 20px;

    border-radius: var(--radius-sm);

    font-weight: 700;

    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background var(--transition);
}

.primary-btn {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.primary-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.secondary-btn {
    background: var(--surface-2);
    color: var(--text);
}

.secondary-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
    transform: translateY(-1px);
}

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

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

.danger-btn {
    background: var(--danger-light);
    color: var(--danger);
}

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

.back-btn {
    background: transparent;
    color: var(--text-light);
    padding-left: 0;
}

.back-btn:hover {
    color: var(--primary);
}

.full-width {
    width: 100%;
}


/* =========================================
   SECTIONS
   ========================================= */

.section {
    margin-bottom: 55px;
}

.section-title {
    margin-bottom: 22px;
}

.section-title h2 {
    font-size: 26px;
    margin-bottom: 4px;
}

.section-title p {
    color: var(--text-light);
}


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

.quick-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.quick-card {
    background: var(--surface);
    border: 1px solid var(--border);

    padding: 24px;

    text-align: left;

    border-radius: var(--radius-md);

    box-shadow: var(--shadow-sm);

    display: flex;
    flex-direction: column;
    gap: 7px;

    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition);
}

.quick-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.quick-icon {
    font-size: 28px;
}

.quick-card strong {
    font-size: 17px;
}

.quick-card small {
    color: var(--text-light);
}


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

.subject-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.subject-card {
    background: var(--surface);
    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    padding: 30px 20px;

    display: flex;
    flex-direction: column;
    align-items: center;

    gap: 8px;

    box-shadow: var(--shadow-sm);

    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition);
}

.subject-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.subject-card span {
    font-size: 40px;
}

.subject-card strong {
    font-size: 18px;
}

.subject-card small {
    color: var(--text-light);
}


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

.stats-grid,
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.stat-card,
.dashboard-stat {
    background: var(--surface);
    border: 1px solid var(--border);

    padding: 22px;

    border-radius: var(--radius-md);

    display: flex;
    flex-direction: column;

    box-shadow: var(--shadow-sm);
}

.stat-card span,
.dashboard-stat span {
    font-size: 25px;
    margin-bottom: 8px;
}

.stat-card strong,
.dashboard-stat strong {
    font-size: 28px;
}

.stat-card small,
.dashboard-stat small {
    color: var(--text-light);
}


/* =========================================
   PAGE HEADINGS
   ========================================= */

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

.page-heading h1 {
    font-size: 36px;
    margin: 8px 0;
}

.page-heading p {
    color: var(--text-light);
}


/* =========================================
   QUIZ SETUP
   ========================================= */

.setup-card {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-lg);

    padding: 35px;

    box-shadow: var(--shadow-sm);
}

.setup-group {
    margin-bottom: 32px;
}

.setup-group h3 {
    margin-bottom: 15px;
    font-size: 18px;
}

.setup-subject-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.setup-subject,
.choice-btn,
.difficulty-btn,
.timer-btn {
    background: var(--surface-2);
    color: var(--text);

    border: 2px solid transparent;

    padding: 13px 16px;

    border-radius: var(--radius-sm);

    transition:
        background var(--transition),
        color var(--transition),
        border-color var(--transition);
}

.setup-subject:hover,
.choice-btn:hover,
.difficulty-btn:hover,
.timer-btn:hover {
    border-color: var(--primary);
}

.setup-subject.selected,
.choice-btn.selected,
.difficulty-btn.selected,
.timer-btn.selected {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    font-weight: 700;
}

.choice-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

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

.mode-btn {
    background: var(--surface-2);

    border: 2px solid transparent;

    padding: 18px;

    border-radius: var(--radius-sm);

    text-align: left;

    display: flex;
    flex-direction: column;
    gap: 4px;

    transition:
        background var(--transition),
        border-color var(--transition);
}

.mode-btn:hover {
    border-color: var(--primary);
}

.mode-btn.selected {
    background: var(--primary-light);
    border-color: var(--primary);
}

.mode-btn small {
    color: var(--text-light);
}

.selected-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.selected-subject-tag {
    background: var(--primary-light);
    color: var(--primary);

    padding: 7px 12px;

    border-radius: 999px;

    font-size: 13px;
    font-weight: 700;
}

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


/* =========================================
   QUIZ PAGE
   ========================================= */

.quiz-top {
    display: flex;
    align-items: center;
    justify-content: space-between;

    margin-bottom: 14px;
}

.quiz-progress-info {
    display: flex;
    gap: 18px;

    font-weight: 700;
}

#timerDisplay {
    color: var(--danger);
}

.progress-bar-container {
    width: 100%;
    height: 8px;

    background: var(--border);

    border-radius: 999px;

    overflow: hidden;

    margin-bottom: 30px;
}

.progress-bar {
    width: 0%;
    height: 100%;

    background: var(--primary);

    border-radius: inherit;

    transition: width 0.3s ease;
}

.quiz-layout {
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: 24px;
    align-items: start;
}

.question-card {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-lg);

    padding: 35px;

    box-shadow: var(--shadow-sm);
}

.question-meta {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.question-tag,
.difficulty-tag {
    padding: 6px 11px;

    border-radius: 999px;

    font-size: 12px;
    font-weight: 700;
}

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

.difficulty-tag {
    background: var(--surface-2);
    color: var(--text-light);
}

.question-card h2 {
    font-size: 25px;
    line-height: 1.45;
    margin-bottom: 25px;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-btn {
    width: 100%;

    background: var(--surface);

    border: 2px solid var(--border);

    padding: 16px 18px;

    border-radius: var(--radius-sm);

    text-align: left;

    display: flex;
    gap: 12px;
    align-items: center;

    transition:
        border-color var(--transition),
        background var(--transition),
        transform var(--transition);
}

.option-btn:hover {
    border-color: var(--primary);
    transform: translateX(2px);
}

.option-letter {
    min-width: 32px;
    height: 32px;

    display: flex;
    align-items: center;
    justify-content: center;

    background: var(--surface-2);

    border-radius: 50%;

    font-weight: 800;
}

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

.option-btn.correct {
    background: var(--success-light);
    border-color: var(--success);
}

.option-btn.incorrect {
    background: var(--danger-light);
    border-color: var(--danger);
}

.question-actions {
    display: flex;
    gap: 10px;

    margin-top: 25px;

    padding-top: 20px;

    border-top: 1px solid var(--border);
}

.practice-feedback {
    margin-top: 18px;

    padding: 16px;

    border-radius: var(--radius-sm);

    background: var(--surface-2);
}

.practice-feedback.correct {
    background: var(--success-light);
    color: var(--success);
}

.practice-feedback.incorrect {
    background: var(--danger-light);
    color: var(--danger);
}

.quiz-navigation {
    display: flex;
    justify-content: flex-end;
    gap: 10px;

    margin-top: 18px;
}


/* =========================================
   QUESTION NAVIGATOR
   ========================================= */

.question-navigator {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    padding: 20px;

    box-shadow: var(--shadow-sm);

    position: sticky;
    top: 95px;
}

.question-navigator h3 {
    margin-bottom: 15px;
}

.question-numbers {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 7px;
}

.question-number {
    aspect-ratio: 1;

    border-radius: 8px;

    background: var(--surface-2);

    color: var(--text);

    font-weight: 700;

    display: flex;
    align-items: center;
    justify-content: center;
}

.question-number.current {
    background: var(--primary);
    color: white;
}

.question-number.answered {
    background: var(--success-light);
    color: var(--success);
}

.question-number.marked {
    box-shadow: inset 0 0 0 2px var(--warning);
}

.navigator-legend {
    display: flex;
    flex-direction: column;

    gap: 7px;

    margin-top: 18px;

    font-size: 12px;
    color: var(--text-light);
}

.navigator-legend span {
    display: flex;
    align-items: center;
    gap: 7px;
}

.legend {
    width: 10px;
    height: 10px;
    border-radius: 3px;
    background: var(--surface-2);
}

.legend.answered {
    background: var(--success);
}

.legend.marked {
    background: var(--warning);
}


/* =========================================
   RESULT
   ========================================= */

.result-container {
    display: flex;
    justify-content: center;
}

.result-card {
    width: min(650px, 100%);

    text-align: center;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-lg);

    padding: 45px;

    box-shadow: var(--shadow-md);
}

.result-icon {
    font-size: 48px;
}

.result-label {
    color: var(--text-light);
    font-weight: 600;
}

.result-card h1 {
    font-size: 34px;
    margin: 5px 0;
}

.result-subject {
    color: var(--primary);
    font-weight: 700;
}

.result-percentage {
    font-size: 76px;
    line-height: 1;

    font-weight: 900;

    color: var(--primary);

    margin: 25px 0 10px;
}

.personal-best {
    display: inline-block;

    margin: 12px 0;

    padding: 8px 14px;

    background: var(--warning-light);
    color: var(--warning);

    border-radius: 999px;

    font-weight: 800;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);

    gap: 10px;

    margin: 30px 0;
}

.result-stats div {
    background: var(--surface-2);

    padding: 15px 8px;

    border-radius: var(--radius-sm);
}

.result-stats strong {
    display: block;
    font-size: 22px;
}

.result-stats span {
    font-size: 12px;
    color: var(--text-light);
}

.result-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;

    gap: 10px;
}


/* =========================================
   REVIEW
   ========================================= */

.review-container {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.review-item {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    padding: 25px;

    box-shadow: var(--shadow-sm);
}

.review-item.correct {
    border-left: 5px solid var(--success);
}

.review-item.incorrect {
    border-left: 5px solid var(--danger);
}

.review-item.unanswered {
    border-left: 5px solid var(--warning);
}

.review-item h3 {
    margin-bottom: 15px;
}

.review-answer {
    margin: 8px 0;
}

.review-explanation {
    background: var(--surface-2);

    padding: 15px;

    border-radius: var(--radius-sm);

    margin-top: 15px;
}


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

.dashboard-stats {
    margin-bottom: 35px;
}

.dashboard-section {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    padding: 25px;

    margin-bottom: 20px;

    box-shadow: var(--shadow-sm);
}

.dashboard-section h2 {
    margin-bottom: 20px;
}

.weekly-chart {
    min-height: 220px;

    display: flex;
    align-items: flex-end;
    justify-content: space-around;

    gap: 12px;

    padding-top: 20px;
}

.chart-day {
    flex: 1;

    display: flex;
    flex-direction: column;

    align-items: center;
    justify-content: flex-end;

    height: 180px;

    gap: 8px;
}

.chart-bar {
    width: min(45px, 70%);

    min-height: 4px;

    background: var(--primary);

    border-radius: 8px 8px 2px 2px;

    transition: height 0.4s ease;
}

.chart-score {
    font-size: 11px;
    font-weight: 700;
}

.chart-label {
    font-size: 11px;
    color: var(--text-light);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);

    gap: 12px;
}

.achievement-card {
    padding: 18px;

    border-radius: var(--radius-md);

    background: var(--surface-2);

    text-align: center;

    opacity: 0.45;
}

.achievement-card.unlocked {
    opacity: 1;
    background: var(--primary-light);
}

.achievement-card .achievement-icon {
    font-size: 30px;
}

.achievement-card strong {
    display: block;
    margin-top: 6px;
}

.subject-progress-item {
    margin-bottom: 18px;
}

.subject-progress-header {
    display: flex;
    justify-content: space-between;

    margin-bottom: 7px;

    font-weight: 700;
}

.subject-progress-track {
    height: 9px;

    background: var(--border);

    border-radius: 999px;

    overflow: hidden;
}

.subject-progress-fill {
    height: 100%;

    background: var(--primary);

    border-radius: inherit;
}

.recent-result {
    display: flex;

    justify-content: space-between;
    align-items: center;

    padding: 15px 0;

    border-bottom: 1px solid var(--border);
}

.recent-result:last-child {
    border-bottom: none;
}

.recent-result small {
    color: var(--text-light);
}


/* =========================================
   SAVED QUESTIONS
   ========================================= */

.question-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.saved-question {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    padding: 22px;

    box-shadow: var(--shadow-sm);
}

.saved-question-meta {
    display: flex;
    gap: 8px;

    margin-bottom: 10px;
}

.saved-question h3 {
    margin-bottom: 15px;
}


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

.settings-card {
    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-lg);

    box-shadow: var(--shadow-sm);

    overflow: hidden;
}

.setting-item {
    padding: 25px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 25px;

    border-bottom: 1px solid var(--border);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-item strong {
    display: block;
    margin-bottom: 4px;
}

.setting-item small {
    color: var(--text-light);
}

.toggle-btn {
    width: 52px;
    height: 32px;

    border-radius: 999px;

    background: var(--surface-2);

    font-size: 16px;
}

.color-themes,
.emoji-themes {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 7px;

    max-width: 600px;
}

.color-themes button,
.emoji-themes button {
    padding: 7px 10px;

    border-radius: 8px;

    background: var(--surface-2);

    font-size: 12px;
}

.color-themes button.selected,
.emoji-themes button.selected {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
}


/* =========================================
   TOAST
   ========================================= */

.toast {
    position: fixed;

    bottom: 25px;
    left: 50%;

    transform: translate(-50%, 120px);

    background: #171717;
    color: white;

    padding: 12px 18px;

    border-radius: 999px;

    z-index: 1000;

    opacity: 0;

    transition:
        transform 0.3s ease,
        opacity 0.3s ease;

    pointer-events: none;
}

.toast.show {
    transform: translate(-50%, 0);
    opacity: 1;
}


/* =========================================
   MODAL
   ========================================= */

.modal {
    position: fixed;

    inset: 0;

    background: rgba(0, 0, 0, 0.5);

    display: flex;

    align-items: center;
    justify-content: center;

    padding: 20px;

    z-index: 900;
}

.modal-content {
    position: relative;

    width: min(600px, 100%);

    max-height: 90vh;
    overflow-y: auto;

    background: var(--surface);

    border-radius: var(--radius-lg);

    padding: 30px;

    box-shadow: var(--shadow-lg);
}

.modal-content h2 {
    margin-bottom: 20px;
}

.modal-close {
    position: absolute;

    right: 18px;
    top: 15px;

    width: 35px;
    height: 35px;

    border-radius: 50%;

    background: var(--surface-2);

    font-size: 22px;
}

.share-card-preview {
    background:
        linear-gradient(
            135deg,
            var(--primary-light),
            var(--surface)
        );

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    padding: 25px;

    margin-bottom: 15px;

    text-align: center;
}

.share-buttons {
    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 8px;

    margin-top: 15px;
}

.share-buttons button {
    padding: 10px;

    border-radius: 8px;

    background: var(--surface-2);
}

.share-buttons button:hover {
    background: var(--primary-light);
    color: var(--primary);
}


/* =========================================
   DARK MODE
   ========================================= */

body.dark {
    --background: #0f1117;
    --surface: #181b24;
    --surface-2: #222631;

    --text: #f3f4f6;
    --text-light: #9ca3af;

    --border: #2d3340;

    --primary-light: #2e2252;

    --success-light: #12351f;
    --danger-light: #3a171b;
    --warning-light: #3b2d12;

    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.4);
}

body.dark .hero {
    background:
        linear-gradient(
            135deg,
            var(--primary-light),
            var(--surface)
        );
}

body.dark .toast {
    background: #f3f4f6;
    color: #111827;
}


/* =========================================
   COLOR THEMES
   ========================================= */

body.theme-purple {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --primary-light: #ede9fe;
}

body.theme-blue {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
}

body.theme-pink {
    --primary: #db2777;
    --primary-dark: #be185d;
    --primary-light: #fce7f3;
}

body.theme-green {
    --primary: #16a34a;
    --primary-dark: #15803d;
    --primary-light: #dcfce7;
}

body.theme-orange {
    --primary: #ea580c;
    --primary-dark: #c2410c;
    --primary-light: #ffedd5;
}

body.theme-red {
    --primary: #dc2626;
    --primary-dark: #b91c1c;
    --primary-light: #fee2e2;
}

body.theme-teal {
    --primary: #0d9488;
    --primary-dark: #0f766e;
    --primary-light: #ccfbf1;
}

body.theme-indigo {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
}

body.theme-rose {
    --primary: #e11d48;
    --primary-dark: #be123c;
    --primary-light: #ffe4e6;
}

body.theme-slate {
    --primary: #475569;
    --primary-dark: #334155;
    --primary-light: #e2e8f0;
}


/* =========================================
   EMPTY STATES
   ========================================= */

.empty-state {
    background: var(--surface);

    border: 1px dashed var(--border);

    border-radius: var(--radius-md);

    padding: 40px 20px;

    text-align: center;

    color: var(--text-light);
}

.empty-state-icon {
    font-size: 42px;
    margin-bottom: 10px;
}


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

@media (max-width: 1000px) {

    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .subject-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .quiz-layout {
        grid-template-columns: 1fr;
    }

    .question-navigator {
        position: static;
    }

    .question-numbers {
        grid-template-columns: repeat(10, 1fr);
    }

    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


@media (max-width: 700px) {

    .header {
        padding: 0 4%;
    }

    .logo {
        font-size: 16px;
    }

    .app-container {
        width: 94%;
        padding-top: 25px;
    }

    .hero {
        min-height: 350px;
        padding: 40px 18px;
    }

    .hero h1 {
        letter-spacing: -1px;
    }

    .hero p {
        font-size: 16px;
    }

    .quick-grid,
    .subject-grid,
    .stats-grid,
    .dashboard-stats {
        grid-template-columns: 1fr;
    }

    .setup-card,
    .question-card,
    .result-card {
        padding: 22px;
    }

    .setup-subject-grid {
        grid-template-columns: 1fr 1fr;
    }

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

    .quiz-top {
        align-items: flex-start;
        gap: 10px;
        flex-direction: column;
    }

    .question-card h2 {
        font-size: 21px;
    }

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

    .quiz-navigation {
        flex-wrap: wrap;
    }

    .quiz-navigation button {
        flex: 1;
    }

    .question-numbers {
        grid-template-columns: repeat(6, 1fr);
    }

    .result-percentage {
        font-size: 60px;
    }

    .result-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .result-actions {
        grid-template-columns: 1fr;
    }

    .setting-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .color-themes,
    .emoji-themes {
        justify-content: flex-start;
    }

    .share-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}


@media (max-width: 420px) {

    .setup-subject-grid {
        grid-template-columns: 1fr;
    }

    .choice-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .question-numbers {
        grid-template-columns: repeat(5, 1fr);
    }

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