/* ═══════════════════════════════════════════════════════════════════
   style.css — CrackLokshewa Bilingual Design System
   ═══════════════════════════════════════════════════════════════════ */

/* ── Design Tokens ─────────────────────────────────────────────────── */
:root {
    --primary:        #2563eb;
    --primary-dark:   #1d4ed8;
    --primary-light:  #eff6ff;
    --success:        #10b981;
    --success-light:  #d1fae5;
    --error:          #ef4444;
    --error-light:    #fee2e2;
    --warning:        #f59e0b;
    --warning-light:  #fef3c7;
    --bg:             #f1f5f9;
    --surface:        #ffffff;
    --surface-2:      #f8fafc;
    --text-1:         #0f172a;
    --text-2:         #475569;
    --text-3:         #94a3b8;
    --border:         #e2e8f0;
    --font-en:        'Inter', sans-serif;
    --font-ne:        'Mukta', 'Inter', sans-serif;
    --radius-sm:      8px;
    --radius-md:      12px;
    --radius-lg:      18px;
    --radius-full:    9999px;
    --shadow-sm:      0 1px 3px rgba(0,0,0,.08);
    --shadow-md:      0 4px 12px rgba(0,0,0,.10);
    --shadow-lg:      0 12px 32px rgba(0,0,0,.12);
    --transition:     200ms ease;
    --max-w:          1200px;
}

/* ── Base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-en);
    background: var(--bg);
    color: var(--text-1);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
body.lang-ne { font-family: var(--font-ne); line-height: 1.7; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }

/* ── Layout ────────────────────────────────────────────────────────── */
.container {
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 1.5rem;
}
#app-container {
    flex: 1;
    padding: 2.5rem 1.5rem;
}

/* ── Header ────────────────────────────────────────────────────────── */
.app-header {
    background: var(--surface);
    box-shadow: 0 1px 0 var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    user-select: none;
    text-decoration: none;
    color: var(--text-1);
}
.logo .highlight { color: var(--primary); }
.main-nav { display: flex; align-items: center; gap: 1.5rem; }
.nav-link {
    text-decoration: none;
    color: var(--text-2);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition);
}
.nav-link:hover { color: var(--primary); }

.lang-toggle {
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 700;
    transition: all var(--transition);
}
.lang-toggle:hover {
    background: var(--primary);
    color: #fff;
}

/* ── Footer ────────────────────────────────────────────────────────── */
.app-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1.25rem 0;
    text-align: center;
    color: var(--text-3);
    font-size: 0.875rem;
}

/* ── Typography helpers ─────────────────────────────────────────────── */
.page-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}
.page-subtitle {
    font-size: 1.05rem;
    color: var(--text-2);
    margin-bottom: 2rem;
}
.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; color: var(--text-2); }
.mt-8 { margin-top: 2rem; }
.mb-4 { margin-bottom: 1rem; }

/* ── Animations ─────────────────────────────────────────────────────── */
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeSlideIn 280ms ease forwards; }

@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
    width: 36px; height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 0.75rem;
}
.loading-spinner {
    text-align: center;
    color: var(--text-2);
    padding: 4rem 1rem;
    font-size: 1rem;
}

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 1.4rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    transition: all var(--transition);
    white-space: nowrap;
}
.btn:disabled { opacity: 0.45; pointer-events: none; }

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(37,99,235,.25);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(37,99,235,.35);
}
.btn-secondary {
    background: var(--surface);
    color: var(--text-1);
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--surface-2); }

.btn-submit {
    background: var(--success);
    color: #fff;
    box-shadow: 0 2px 8px rgba(16,185,129,.25);
}
.btn-submit:hover {
    background: #059669;
    transform: translateY(-1px);
}
.btn-danger {
    background: transparent;
    color: var(--error);
    border: 1px solid var(--error);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}
.btn-danger:hover { background: var(--error-light); }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.85rem; }
.btn-ghost {
    background: transparent;
    color: var(--text-2);
    border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--surface-2); }
.btn-mark {
    background: var(--warning-light);
    color: #92400e;
    border: 1px solid var(--warning);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}
.btn-mark:hover { background: var(--warning); color: #fff; }
.btn-mark.active {
    background: var(--warning);
    color: #fff;
}

/* ── Language Selector ─────────────────────────────────────────────── */
.lang-selector {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    text-align: center;
}
.lang-selector .logo-text { font-size: 2rem; margin-bottom: 0.5rem; }
.lang-selector .page-subtitle { margin-bottom: 2.5rem; }
.lang-options {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}
.lang-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem 2.5rem;
    cursor: pointer;
    transition: all var(--transition);
    min-width: 160px;
}
.lang-card:hover, .lang-card:focus {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    outline: none;
}
.lang-card .lang-flag { font-size: 2.5rem; margin-bottom: 0.75rem; }
.lang-card .lang-name { font-size: 1.25rem; font-weight: 700; }
.lang-card .lang-native { font-size: 0.875rem; color: var(--text-2); margin-top: 0.25rem; }

/* ── Home hero ──────────────────────────────────────────────────────── */
.hero {
    text-align: center;
    padding: 1rem 0 0.5rem;
}

/* ── Category Cards ─────────────────────────────────────────────────── */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-top: 2rem;
}
.card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 250ms ease;
}
.category-card {
    cursor: pointer;
    text-align: center;
}
.category-card:hover, .category-card:focus {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
    outline: none;
}
.card-icon {
    width: 68px; height: 68px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1rem;
}
.card-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.35rem; }
.card-desc  { font-size: 0.875rem; color: var(--text-2); margin-bottom: 1rem; }
.card-action { font-size: 0.875rem; font-weight: 600; }

/* ── Tests List ─────────────────────────────────────────────────────── */
.tests-list { display: flex; flex-direction: column; gap: 1rem; margin-top: 1.5rem; }
.test-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
}
.test-card-num {
    flex-shrink: 0;
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
}
.test-info { flex: 1; min-width: 0; }
.test-title { font-size: 1rem; font-weight: 600; margin-bottom: 0.4rem; }
.test-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.meta-tag {
    background: var(--bg);
    padding: 0.2rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-2);
}
.difficulty-easy   { background: var(--success-light); color: #065f46; }
.difficulty-medium { background: var(--warning-light); color: #92400e; }
.difficulty-hard   { background: var(--error-light);   color: #991b1b; }
.badge-locked {
    background: var(--bg);
    color: var(--text-3);
    border: 1px solid var(--border);
    padding: 0.45rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}
@media (max-width: 600px) {
    .test-card { flex-wrap: wrap; }
    .test-card .btn { width: 100%; }
}

/* ── Test Engine ────────────────────────────────────────────────────── */
.test-container { max-width: 840px; margin: 0 auto; }
.test-topbar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}
.test-info-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}
.q-counter        { font-size: 0.95rem; font-weight: 600; color: var(--text-1); }
.answered-count   { font-size: 0.875rem; color: var(--text-2); }
.timer {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    margin-left: auto;
    font-variant-numeric: tabular-nums;
    letter-spacing: 1px;
}
.timer.urgent { color: var(--error); }
.progress-bar-bg {
    height: 6px;
    background: var(--border);
    border-radius: var(--radius-full);
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #60a5fa);
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
}

/* Question card */
.question-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}
.question-number {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary);
    margin-bottom: 0.75rem;
}
.question-text {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.65;
    margin-bottom: 1.75rem;
    color: var(--text-1);
}
body.lang-ne .question-text { font-size: 1.25rem; line-height: 1.7; }
.options-list { display: flex; flex-direction: column; gap: 0.75rem; }
.option-label {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.9rem 1.15rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    user-select: none;
}
.option-label:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.option-label.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}
.option-letter {
    flex-shrink: 0;
    width: 30px; height: 30px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-2);
    transition: all var(--transition);
}
.option-label.selected .option-letter {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.option-text { font-size: 0.975rem; font-weight: 500; line-height: 1.5; }
body.lang-ne .option-text { font-size: 1.05rem; }

/* Test navigation */
.test-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}
.test-nav-center {
    display: flex;
    gap: 0.75rem;
}

/* Question Palette */
.palette-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}
.palette-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-1);
}
.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 0.5rem;
}
.palette-btn {
    width: 40px; height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text-2);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
}
.palette-btn:hover { border-color: var(--primary); color: var(--primary); }
.palette-btn.current { border-color: var(--primary); color: var(--primary); background: var(--primary-light); box-shadow: 0 0 0 2px var(--primary); }
.palette-btn.answered { background: var(--success-light); color: #065f46; border-color: var(--success); }
.palette-btn.marked { background: var(--warning-light); color: #92400e; border-color: var(--warning); }
.palette-btn.answered.marked { background: linear-gradient(135deg, var(--success-light) 50%, var(--warning-light) 50%); border-color: var(--success); }

.palette-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-2);
}
.palette-legend span { display: flex; align-items: center; gap: 0.35rem; }
.legend-dot { width: 10px; height: 10px; border-radius: 2px; }

/* ── Results ────────────────────────────────────────────────────────── */
.results-container { max-width: 780px; margin: 0 auto; }
.score-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}
.score-circle {
    width: 140px; height: 140px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    border: 5px solid var(--primary);
    background: var(--primary-light);
}
.grade-excellent { border-color: var(--success); background: var(--success-light); }
.grade-good      { border-color: #6366f1;         background: #ede9fe; }
.grade-pass      { border-color: var(--warning);  background: var(--warning-light); }
.grade-fail      { border-color: var(--error);    background: var(--error-light); }
.score-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}
.grade-excellent .score-number { color: var(--success); }
.grade-fail      .score-number { color: var(--error); }
.score-denom { font-size: 0.9rem; color: var(--text-2); font-weight: 600; }
.score-percentage { font-size: 1.75rem; font-weight: 700; margin-bottom: 0.25rem; }
.score-grade { font-size: 1.1rem; color: var(--text-2); margin-bottom: 0.5rem; }
.score-note { font-size: 0.8rem; color: var(--text-3); }

.score-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}
.breakdown-item {
    background: var(--bg);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
}
.breakdown-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-1);
}
.breakdown-label {
    font-size: 0.75rem;
    color: var(--text-2);
    margin-top: 0.25rem;
}

.results-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 2.5rem;
}

/* Subject-wise analysis */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}
.subject-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}
.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}
.subject-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-1);
}
body.lang-ne .subject-name { font-size: 1rem; }
.subject-pct {
    font-weight: 700;
    font-size: 0.9rem;
}
.subject-bar-bg {
    height: 6px;
    background: var(--bg);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 0.5rem;
}
.subject-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 600ms ease;
}
.subject-stats {
    display: flex;
    gap: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-2);
}
.subject-stats span { display: flex; align-items: center; gap: 0.2rem; }
.subject-total { margin-left: auto; font-weight: 600; color: var(--text-3); }

/* Review cards */
.review-list { display: flex; flex-direction: column; gap: 1.25rem; }
.review-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    border-left: 4px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.review-card.correct   { border-left-color: var(--success); }
.review-card.incorrect { border-left-color: var(--error); }
.review-card.skipped   { border-left-color: var(--text-3); }
.review-qheader {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.review-question { font-size: 1rem; font-weight: 600; line-height: 1.55; flex: 1; }
body.lang-ne .review-question { font-size: 1.1rem; }
.review-badge {
    flex-shrink: 0;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    background: var(--bg);
    color: var(--text-2);
}
.review-card.correct   .review-badge { background: var(--success-light); color: #065f46; }
.review-card.incorrect .review-badge { background: var(--error-light);   color: #991b1b; }

.review-options { display: flex; flex-direction: column; gap: 0.5rem; }
.review-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--bg);
    font-size: 0.9rem;
}
body.lang-ne .review-option { font-size: 1rem; }
.is-correct-answer {
    background: var(--success-light);
    color: #065f46;
    font-weight: 600;
}
.is-wrong-answer {
    background: var(--error-light);
    color: #991b1b;
    text-decoration: line-through;
}
.tick  { margin-left: auto; color: var(--success); font-weight: 800; }
.cross { margin-left: auto; color: var(--error);   font-weight: 800; }
.explanation {
    margin-top: 1rem;
    padding: 0.9rem 1rem;
    background: #eff6ff;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: #1e40af;
    line-height: 1.55;
}
body.lang-ne .explanation { font-size: 0.95rem; }

/* ── Empty / Error states ────────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-2);
    font-size: 1rem;
}
.error-msg {
    text-align: center;
    padding: 2rem;
    color: var(--error);
    background: var(--error-light);
    border-radius: var(--radius-md);
    font-weight: 500;
}

/* ── About page ─────────────────────────────────────────────────────── */
.about-container { max-width: 720px; margin: 0 auto; }
.about-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    margin-top: 1.5rem;
    line-height: 1.75;
    color: var(--text-1);
}
.about-card h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.about-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; padding-left: 0.25rem; }
.about-list li::before { content: ''; }

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 640px) {
    .test-info-row { gap: 0.5rem; }
    .timer { margin-left: 0; width: 100%; }
    .question-card { padding: 1.25rem; }
    .question-text { font-size: 1rem; }
    .test-navigation { flex-direction: column-reverse; }
    .test-navigation .btn { width: 100%; }
    .test-nav-center { width: 100%; }
    .test-nav-center .btn { flex: 1; }
    .results-actions .btn { flex: 1; min-width: 120px; }
    .palette-grid { grid-template-columns: repeat(10, 1fr); }
    .palette-btn { width: 100%; height: 36px; }
    .lang-options { flex-direction: column; align-items: center; }
    .lang-card { width: 100%; max-width: 280px; }
    .header-content { gap: 0.75rem; }
    .main-nav { gap: 0.75rem; }
    .logo-text { font-size: 1.1rem; }
}