/* ╔══════════════════════════════════════════════════════════════════╗
   ║  SelfUI — Unified Design System for SelfQuiz                    ║
   ║  Merged from MCQ + SQ + CQ templates                           ║
   ║  Version 1.0  |  selfstudy.xyz                                 ║
   ╚══════════════════════════════════════════════════════════════════╝ */

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

/* ══════════════════════════════════════════════════
   LIGHT MODE (default)
   ══════════════════════════════════════════════════ */
:root {
    /* Brand */
    --primary:        #0d6efd;
    --primary-hover:  #0b5ed7;
    --primary-light:  #e8f0fe;
    --primary-glow:   rgba(13,110,253,0.15);
    --accent:         #6366f1;
    --accent-hover:   #4f46e5;

    /* Surfaces */
    --bg:             #f4f7f6;
    --bg-elevated:    #ffffff;
    --card:           #ffffff;
    --card-hover:     #f8fafc;

    /* Text */
    --text:           #1e293b;
    --text-secondary: #475569;
    --muted:          #64748b;

    /* Borders & Shadows */
    --border:         #e2e8f0;
    --border-strong:  #cbd5e1;
    --shadow-sm:      0 1px 3px rgba(0,0,0,0.06);
    --shadow:         0 4px 16px rgba(0,0,0,0.08);
    --shadow-md:      0 8px 30px rgba(0,0,0,0.12);
    --shadow-lg:      0 16px 48px rgba(0,0,0,0.15);

    /* Gradients */
    --header-grad:    linear-gradient(135deg, #0d6efd 0%, #6366f1 100%);
    --section-grad:   linear-gradient(135deg, #1d4ed8 0%, #4f46e5 100%);
    --hero-grad:      linear-gradient(135deg, #0d6efd 0%, #6366f1 50%, #8b5cf6 100%);

    /* States */
    --correct:        #16a34a;
    --correct-bg:     #dcfce7;
    --wrong:          #dc2626;
    --wrong-bg:       #fee2e2;
    --warning:        #ca8a04;
    --warning-bg:     #fef9c3;
    --hover-bg:       #f1f5f9;

    /* Explanation */
    --explain-bg:     #eef3ff;
    --explain-border: #0d6efd;
    --explain-text:   #1a3a6b;

    /* Tracker & Score */
    --tracker-bg:     #e8f0fe;
    --tracker-text:   #0d6efd;
    --score-bg:       #d1fae5;
    --score-text:     #065f46;

    /* Chips */
    --chip-bg:        #f0f4ff;
    --chip-border:    #c7d9ff;
    --chip-val:       #0d6efd;

    /* SQ Type Colors (জ্ঞানমূলক = blue) */
    --type-color:     #0369a1;
    --type-bg:        #e0f2fe;
    --type-border:    #7dd3fc;
    --type-dot:       #0ea5e9;
    --type-badge:     #0ea5e9;
    --type-ans-bg:    #f0f9ff;
    --type-ans-bd:    #bae6fd;

    /* CQ Part Colors */
    --ka-color:    #0369a1; --ka-bg:   #e0f2fe; --ka-border:  #7dd3fc; --ka-dot:  #0ea5e9;
    --kha-color:   #065f46; --kha-bg:  #d1fae5; --kha-border: #6ee7b7; --kha-dot: #10b981;
    --ga-color:    #92400e; --ga-bg:   #fef3c7; --ga-border:  #fcd34d; --ga-dot:  #f59e0b;
    --gha-color:   #6b21a8; --gha-bg:  #f3e8ff; --gha-border: #c084fc; --gha-dot: #a855f7;

    /* Uddipak */
    --uddipak-bg:     #f8faff;
    --uddipak-border: #bfdbfe;

    /* Glassmorphism */
    --glass-bg:       rgba(255,255,255,0.7);
    --glass-border:   rgba(255,255,255,0.4);
    --glass-blur:     16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition:      0.25s ease;
    --transition-slow: 0.4s ease;
}


/* ══════════════════════════════════════════════════
   DARK MODE
   ══════════════════════════════════════════════════ */
body.dark {
    --primary:        #5b9cf6;
    --primary-hover:  #4a88e8;
    --primary-light:  #1e2e46;
    --primary-glow:   rgba(91,156,246,0.15);
    --accent:         #818cf8;
    --accent-hover:   #6366f1;

    --bg:             #0f172a;
    --bg-elevated:    #1e293b;
    --card:           #1e293b;
    --card-hover:     #253449;

    --text:           #e2e8f0;
    --text-secondary: #94a3b8;
    --muted:          #64748b;

    --border:         #334155;
    --border-strong:  #475569;
    --shadow-sm:      0 1px 3px rgba(0,0,0,0.25);
    --shadow:         0 4px 16px rgba(0,0,0,0.35);
    --shadow-md:      0 8px 30px rgba(0,0,0,0.4);
    --shadow-lg:      0 16px 48px rgba(0,0,0,0.5);

    --header-grad:    linear-gradient(135deg, #1e3a5f 0%, #312e81 100%);
    --section-grad:   linear-gradient(135deg, #1a2e50 0%, #312e81 100%);
    --hero-grad:      linear-gradient(135deg, #1e3a5f 0%, #312e81 50%, #4c1d95 100%);

    --correct:        #22c55e;
    --correct-bg:     #14532d;
    --wrong:          #ef4444;
    --wrong-bg:       #450a0a;
    --warning:        #eab308;
    --warning-bg:     #422006;
    --hover-bg:       #334155;

    --explain-bg:     #1e2e46;
    --explain-border: #5b9cf6;
    --explain-text:   #a8c4f0;

    --tracker-bg:     #1e2e46;
    --tracker-text:   #7ab3f5;
    --score-bg:       #14532d;
    --score-text:     #4ade80;

    --chip-bg:        #1e2e46;
    --chip-border:    #334155;
    --chip-val:       #7ab3f5;

    --type-color:     #7dd3fc;
    --type-bg:        #0c2a3e;
    --type-border:    #1d5f8a;
    --type-dot:       #38bdf8;
    --type-badge:     #0369a1;
    --type-ans-bg:    #0a1e2e;
    --type-ans-bd:    #1d4a6a;

    --ka-color:    #7dd3fc; --ka-bg:   #0c2a3e; --ka-border:  #1d5f8a; --ka-dot:  #38bdf8;
    --kha-color:   #6ee7b7; --kha-bg:  #082f22; --kha-border: #10573a; --kha-dot: #34d399;
    --ga-color:    #fcd34d; --ga-bg:   #2d2008; --ga-border:  #6b4c10; --ga-dot:  #fbbf24;
    --gha-color:   #c084fc; --gha-bg:  #2a1040; --gha-border: #6b2fa0; --gha-dot: #c084fc;

    --uddipak-bg:     #18243a;
    --uddipak-border: #2e4a6e;

    --glass-bg:       rgba(30,41,59,0.7);
    --glass-border:   rgba(51,65,85,0.5);
    --glass-blur:     16px;
}




/* ══════════════════════════════════════════════════
   BASE RESET & GLOBALS
   ══════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: 'Hind Siliguri', 'Inter', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img { max-width: 100%; display: block; }

button {
    font-family: 'Hind Siliguri', 'Inter', Arial, sans-serif;
    cursor: pointer;
    border: none;
    outline: none;
    transition: all var(--transition-fast);
}

input, select, textarea {
    font-family: 'Hind Siliguri', 'Inter', Arial, sans-serif;
    font-size: 15px;
    color: var(--text);
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}
/* Fix select option colors in dark mode */
select option {
    background: var(--card);
    color: var(--text);
}
body.dark select option {
    background: #1e293b;
    color: #e2e8f0;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 0.7; }

::selection { background: var(--primary); color: white; }


/* ══════════════════════════════════════════════════
   UTILITY CLASSES
   ══════════════════════════════════════════════════ */
.container { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.container-sm { max-width: 600px; margin: 0 auto; padding: 0 16px; }
.container-lg { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-4 { gap: 4px; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.gap-32 { gap: 32px; }

.text-center { text-align: center; }
.text-muted { color: var(--muted); }
.text-primary { color: var(--primary); }
.text-sm { font-size: 13px; }
.text-xs { font-size: 11px; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }


/* ══════════════════════════════════════════════════
   SITE HEADER / NAVBAR
   ══════════════════════════════════════════════════ */
.site-header {
    background: var(--header-grad);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 16px rgba(0,0,0,0.2);
}
.header-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 12px;
}
.header-left {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}
.header-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: white;
}
.header-brand-icon {
    width: 32px;
    height: 32px;
    background: rgba(255,255,255,0.2);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}
.header-brand-text {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.3px;
    color: white;
}
.header-site-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: rgba(255,255,255,0.72);
    text-decoration: none;
    font-size: 11px;
    font-weight: 600;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 99px;
    padding: 3px 10px;
    transition: all 0.2s;
    width: fit-content;
}
.header-site-link:hover { background: rgba(255,255,255,0.2); color: white; }
.header-site-link svg { width: 11px; height: 11px; flex-shrink: 0; }

.site-header h1 {
    font-size: clamp(15px, 3vw, 21px);
    font-weight: 700;
    color: white;
    line-height: 1.2;
}
.site-header p {
    font-size: 12px;
    color: rgba(255,255,255,0.72);
    margin-top: 1px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.header-nav a {
    color: rgba(255,255,255,0.8);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 8px;
    transition: all 0.2s;
    text-decoration: none;
    white-space: nowrap;
}
.header-nav a:hover,
.header-nav a.active {
    background: rgba(255,255,255,0.15);
    color: white;
}

/* Dark mode toggle button */
.dark-btn {
    background: rgba(255,255,255,0.14);
    border: 1.5px solid rgba(255,255,255,0.28);
    color: white;
    padding: 6px 13px;
    border-radius: 20px;
    font-size: 12px;
    font-family: 'Hind Siliguri', Arial, sans-serif;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s;
    flex-shrink: 0;
}
.dark-btn:hover { background: rgba(255,255,255,0.24); }

/* User avatar in header */
.header-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.4);
    object-fit: cover;
    cursor: pointer;
    transition: border-color 0.2s;
}
.header-avatar:hover { border-color: rgba(255,255,255,0.8); }


/* ══════════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}
.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    background: rgba(255,255,255,0.1);
    transition: opacity 0.2s;
}
.btn:hover::before { opacity: 1; }

.btn-primary {
    background: var(--header-grad);
    color: white;
    box-shadow: 0 4px 18px rgba(13,110,253,0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(13,110,253,0.4);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
    background: var(--card);
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.btn-ghost {
    background: transparent;
    color: var(--primary);
    padding: 10px 20px;
}
.btn-ghost:hover { background: var(--primary-glow); }

.btn-danger {
    background: var(--wrong);
    color: white;
}
.btn-danger:hover { background: #b91c1c; }

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: 8px;
}
.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
    border-radius: 12px;
}
.btn-full { width: 100%; }
.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Google Sign-In Button */
.btn-google {
    background: white;
    color: #1f1f1f;
    border: 1.5px solid #dadce0;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 12px;
    gap: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
body.dark .btn-google {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #475569;
}
.btn-google:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    transform: translateY(-1px);
}
.btn-google img {
    width: 20px;
    height: 20px;
}

/* Pulse animation for CTA buttons */
.btn-pulse { position: absolute; inset: 0; border-radius: inherit; animation: btnPulse 2.2s ease infinite; pointer-events: none; }
@keyframes btnPulse {
    0%   { box-shadow: 0 0 0 0 rgba(13,110,253,0.4); }
    70%  { box-shadow: 0 0 0 13px rgba(13,110,253,0); }
    100% { box-shadow: 0 0 0 0 rgba(13,110,253,0); }
}


/* ══════════════════════════════════════════════════
   CARDS
   ══════════════════════════════════════════════════ */
.card {
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }

.card-body { padding: 24px; }
.card-header {
    padding: 16px 24px;
    border-bottom: 1.5px solid var(--border);
    font-weight: 700;
    font-size: 16px;
}

/* Glass card */
.card-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1.5px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}


/* ══════════════════════════════════════════════════
   BADGES & CHIPS
   ══════════════════════════════════════════════════ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
    border-radius: 99px;
    padding: 4px 12px;
    white-space: nowrap;
}
.badge-primary { background: var(--primary-light); color: var(--primary); border: 1px solid var(--chip-border); }
.badge-correct { background: var(--correct-bg); color: var(--correct); }
.badge-wrong   { background: var(--wrong-bg); color: var(--wrong); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-admin   { background: linear-gradient(135deg, #f59e0b, #d97706); color: white; }

.chip {
    padding: 7px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}
.chip.green  { background: var(--correct-bg); color: var(--score-text); }
.chip.red    { background: var(--wrong-bg); color: var(--wrong); }
.chip.yellow { background: var(--warning-bg); color: var(--warning); }

/* Info chip (start screen style) */
.info-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    background: var(--chip-bg);
    border: 1.5px solid var(--chip-border);
    border-radius: 12px;
    padding: 10px 20px;
    min-width: 86px;
}
.info-chip .chip-val {
    font-size: 20px;
    font-weight: 700;
    color: var(--chip-val);
}
.info-chip .chip-label {
    font-size: 10px;
    color: var(--muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}


/* ══════════════════════════════════════════════════
   FORM ELEMENTS
   ══════════════════════════════════════════════════ */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}
.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.3px;
}
.form-input {
    width: 100%;
}
.form-select {
    width: 100%;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M2 5l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
    cursor: pointer;
}
.form-hint {
    font-size: 12px;
    color: var(--muted);
}
.form-error {
    font-size: 12px;
    color: var(--wrong);
    font-weight: 600;
}


/* ══════════════════════════════════════════════════
   MODAL / DIALOG
   ══════════════════════════════════════════════════ */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 500;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.modal-overlay.show {
    opacity: 1;
    pointer-events: all;
}
.modal {
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 20px;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95) translateY(10px);
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.modal-overlay.show .modal {
    transform: scale(1) translateY(0);
}
.modal-header {
    padding: 24px 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-title {
    font-size: 20px;
    font-weight: 700;
}
.modal-close {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hover-bg);
    color: var(--muted);
    border: none;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s;
}
.modal-close:hover { background: var(--border); color: var(--text); }
.modal-body { padding: 20px 24px 24px; }
.modal-footer {
    padding: 0 24px 24px;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}


/* ══════════════════════════════════════════════════
   TOAST / NOTIFICATIONS
   ══════════════════════════════════════════════════ */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}
.toast {
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 12px;
    padding: 14px 20px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    pointer-events: all;
    animation: toastIn 0.35s cubic-bezier(0.34,1.56,0.64,1);
    min-width: 280px;
}
.toast.success { border-left: 4px solid var(--correct); }
.toast.error   { border-left: 4px solid var(--wrong); }
.toast.info    { border-left: 4px solid var(--primary); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(40px); }
    to   { opacity: 1; transform: translateX(0); }
}


/* ══════════════════════════════════════════════════
   LOADING / SKELETON
   ══════════════════════════════════════════════════ */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.spinner-sm { width: 20px; height: 20px; border-width: 2px; }

.skeleton {
    background: linear-gradient(90deg, var(--border) 25%, var(--hover-bg) 50%, var(--border) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease infinite;
    border-radius: 8px;
}
@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.skeleton-text { height: 14px; margin-bottom: 8px; }
.skeleton-title { height: 22px; width: 60%; margin-bottom: 12px; }
.skeleton-avatar { width: 48px; height: 48px; border-radius: 50%; }
.skeleton-card { height: 120px; }


/* ══════════════════════════════════════════════════
   SITE FOOTER
   ══════════════════════════════════════════════════ */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 24px 16px;
    text-align: center;
    transition: border-color 0.3s;
    margin-top: auto;
}
.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}
.footer-link {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--muted);
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 11px;
    border-radius: 99px;
    border: 1px solid transparent;
    transition: all 0.22s;
}
.footer-link .ico { width: 13px; height: 13px; opacity: 0.75; flex-shrink: 0; }
.footer-link:hover    { color: var(--primary); border-color: rgba(13,110,253,0.28); background: rgba(13,110,253,0.06); }
.footer-link.yt:hover { color: #dc2626; border-color: rgba(220,38,38,0.28); background: rgba(220,38,38,0.06); }
.footer-link.fb:hover { color: #1d6bcf; border-color: rgba(29,107,207,0.28); background: rgba(29,107,207,0.06); }
body.dark .footer-link:hover    { color: #5b9cf6; border-color: rgba(91,156,246,0.30); background: rgba(91,156,246,0.07); }
body.dark .footer-link.yt:hover { color: #f87171; border-color: rgba(248,113,113,0.28); background: rgba(248,113,113,0.06); }
body.dark .footer-link.fb:hover { color: #60a5fa; border-color: rgba(96,165,250,0.28); background: rgba(96,165,250,0.06); }
.footer-sep { width: 3px; height: 3px; border-radius: 50%; background: var(--border); margin: 0 3px; }
.footer-copy { font-size: 11px; color: var(--muted); }


/* ══════════════════════════════════════════════════
   ANIMATIONS
   ══════════════════════════════════════════════════ */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: none; }
}
@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-18px); }
    to   { opacity: 1; transform: none; }
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to   { opacity: 1; transform: none; }
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25%      { transform: translateX(-5px); }
    75%      { transform: translateX(5px); }
}
@keyframes iconBounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-8px); }
}
@keyframes cardIn {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to   { opacity: 1; transform: none; }
}
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50%      { transform: translateY(-10px); }
}
@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.anim-fade-in     { animation: fadeIn 0.4s ease; }
.anim-fade-up     { animation: fadeUp 0.45s ease; }
.anim-fade-down   { animation: fadeDown 0.45s ease; }
.anim-scale-in    { animation: scaleIn 0.4s cubic-bezier(0.34,1.56,0.64,1); }
.anim-slide-right { animation: slideInRight 0.4s ease; }
.anim-shake       { animation: shake 0.35s; }
.anim-float       { animation: float 3s ease infinite; }

/* Staggered animation delays */
.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.10s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.20s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.30s; }


/* ══════════════════════════════════════════════════
   QUIZ-SPECIFIC: MCQ START SCREEN
   ══════════════════════════════════════════════════ */
.start-screen {
    position: fixed; inset: 0; z-index: 300;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 24px 16px;
    background-color: var(--bg);
    transition: opacity 0.45s ease, transform 0.45s ease;
}
.start-screen.hide { opacity: 0; transform: scale(1.04); pointer-events: none; }

.start-card {
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 20px;
    padding: 36px 36px 28px;
    width: 100%; max-width: 500px; text-align: center;
    position: relative; overflow: hidden;
    box-shadow: var(--shadow-md);
    animation: cardIn 0.65s cubic-bezier(0.34,1.56,0.64,1);
}
.start-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), #60a5fa, var(--primary));
    background-size: 200% 100%;
    animation: shimmer 3s ease infinite;
}
.start-icon { font-size: 54px; line-height: 1; margin-bottom: 14px; animation: iconBounce 2.4s ease infinite; }
.start-badge {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 11px; letter-spacing: 2px; color: var(--primary);
    text-transform: uppercase;
    background: var(--tracker-bg); border: 1px solid var(--explain-border);
    border-radius: 99px; padding: 4px 14px; margin-bottom: 14px;
}
.start-title { font-size: clamp(22px,5vw,32px); font-weight: 700; color: var(--primary); line-height: 1.2; margin-bottom: 8px; }
.start-sub   { color: var(--muted); font-size: 14px; line-height: 1.65; margin-bottom: 26px; }
.start-info-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 28px; }
.start-btn {
    width: 100%;
    background: var(--header-grad);
    border: none; border-radius: 12px; padding: 15px 24px;
    font-size: 18px; font-weight: 700; color: #fff;
    cursor: pointer; position: relative; overflow: hidden;
    transition: transform 0.22s, box-shadow 0.22s;
    box-shadow: 0 4px 18px rgba(13,110,253,0.35);
}
.start-btn::before { content: ''; position: absolute; inset: 0; opacity: 0; background: rgba(255,255,255,0.12); transition: opacity 0.22s; }
.start-btn:hover::before { opacity: 1; }
.start-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(13,110,253,0.45); }
.start-btn:active { transform: translateY(0); }


/* ══════════════════════════════════════════════════
   QUIZ-SPECIFIC: MCQ PLAYER
   ══════════════════════════════════════════════════ */
.quiz-wrapper { width: 100%; max-width: 600px; display: flex; flex-direction: column; margin: 0 auto; }
.quiz-container { background-color: var(--card); border-radius: 12px; box-shadow: var(--shadow); overflow: hidden; transition: background-color 0.3s, box-shadow 0.3s; }
.quiz-header { background: var(--header-grad); padding: 18px 24px 0; color: white; }
.quiz-header h2 { font-size: 21px; font-weight: 700; color: white; line-height: 1.25; }
.quiz-header .sub { font-size: 12px; color: rgba(255,255,255,0.78); margin-top: 3px; }
.progress-wrap { background: rgba(255,255,255,0.20); height: 5px; margin-top: 14px; }
.progress-bar { height: 100%; background: #facc15; transition: width 0.45s ease; width: 0%; }

/* Card body & meta */
.card-body-quiz { padding: 24px 24px 22px; }
.meta-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.question-tracker { background: var(--tracker-bg); color: var(--tracker-text); font-size: 13px; font-weight: 700; padding: 5px 13px; border-radius: 20px; }
.score-badge { background: var(--score-bg); color: var(--score-text); font-size: 13px; font-weight: 700; padding: 5px 13px; border-radius: 20px; }

/* Timer ring */
.timer-wrap { position: relative; width: 46px; height: 46px; flex-shrink: 0; }
.timer-wrap svg { transform: rotate(-90deg); width: 46px; height: 46px; }
.timer-track { fill: none; stroke: var(--border); stroke-width: 4; }
.timer-fill { fill: none; stroke: var(--primary); stroke-width: 4; stroke-linecap: round; stroke-dasharray: 113.1; stroke-dashoffset: 0; transition: stroke-dashoffset 1s linear, stroke 0.4s; }
.timer-fill.warn { stroke: var(--wrong); }
.timer-num { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); font-size: 13px; font-weight: 700; color: var(--primary); }
.timer-num.warn { color: var(--wrong); }

/* Question */
.question-text { font-size: 20px; font-weight: 700; margin-bottom: 18px; line-height: 1.5; color: var(--text); }

/* Options – Kahoot 2×2 grid */
.options-container { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
@media(max-width:480px) { .options-container { grid-template-columns: 1fr; } }
.option-btn {
    background: var(--card); border: 2px solid var(--border); border-radius: 10px;
    padding: 16px 14px; font-size: 17px; text-align: left; cursor: pointer;
    transition: background 0.22s, border-color 0.22s, transform 0.12s, box-shadow 0.18s;
    color: var(--text); display: flex; align-items: center; gap: 11px; min-height: 64px;
}
.option-btn:nth-child(1) { border-left: 4px solid #e53935; }
.option-btn:nth-child(2) { border-left: 4px solid #1e88e5; }
.option-btn:nth-child(3) { border-left: 4px solid #43a047; }
.option-btn:nth-child(4) { border-left: 4px solid #fb8c00; }
.option-btn .opt-label {
    display: inline-flex; align-items: center; justify-content: center;
    width: 30px; height: 30px; min-width: 30px; border-radius: 50%;
    font-size: 13px; font-weight: 700; flex-shrink: 0;
}
.option-btn:nth-child(1) .opt-label { background: #fde8e8; color: #c62828; }
.option-btn:nth-child(2) .opt-label { background: #e3f0fb; color: #1565c0; }
.option-btn:nth-child(3) .opt-label { background: #e8f5e9; color: #2e7d32; }
.option-btn:nth-child(4) .opt-label { background: #fff3e0; color: #e65100; }
body.dark .option-btn:nth-child(1) .opt-label { background: #3b1a1a; color: #ef9a9a; }
body.dark .option-btn:nth-child(2) .opt-label { background: #152536; color: #90caf9; }
body.dark .option-btn:nth-child(3) .opt-label { background: #1a2e1a; color: #a5d6a7; }
body.dark .option-btn:nth-child(4) .opt-label { background: #2e2010; color: #ffcc80; }
.option-btn:hover:not(:disabled) { background: var(--hover-bg); transform: translateY(-2px); box-shadow: 0 4px 14px rgba(0,0,0,0.12); }
.option-btn:disabled { cursor: not-allowed; }
.option-btn.correct { background: var(--correct-bg) !important; border-color: var(--correct) !important; }
.option-btn.correct .opt-label { background: var(--correct) !important; color: white !important; }
.option-btn.wrong { background: var(--wrong-bg) !important; border-color: var(--wrong) !important; }
.option-btn.wrong .opt-label { background: var(--wrong) !important; color: white !important; }
.option-btn.timeout-reveal { background: var(--warning-bg) !important; border-color: var(--warning) !important; }
.option-btn.timeout-reveal .opt-label { background: var(--warning) !important; color: white !important; }

/* Explanation */
.explanation-box { display: none; margin-top: 16px; background: var(--explain-bg); border-left: 4px solid var(--explain-border); border-radius: 0 8px 8px 0; padding: 13px 15px; animation: fadeUp 0.3s ease; }
.explanation-box.show { display: block; }
.ex-title { font-size: 13px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.ex-text  { font-size: 15px; line-height: 1.65; color: var(--explain-text); }

/* Footer controls */
.footer-controls { display: flex; justify-content: space-between; align-items: center; margin-top: 22px; }
.timeout-msg { font-size: 13px; color: var(--wrong); font-weight: 600; display: none; }
.timeout-msg.show { display: block; }
.next-btn { background: var(--primary); color: white; border: none; padding: 12px 26px; font-size: 17px; border-radius: 8px; cursor: pointer; display: none; font-weight: 700; transition: background 0.22s, transform 0.1s; margin-left: auto; }
.next-btn.show { display: block; }
.next-btn:hover { background: var(--primary-hover); transform: translateY(-1px); }

/* Result screen */
.result-container { display: none; text-align: center; padding: 10px 0 8px; }
.result-emoji { font-size: 60px; margin-bottom: 8px; }
.result-container h3 { font-size: 26px; color: var(--primary); margin-bottom: 6px; }
.result-score-big { font-size: 52px; font-weight: 700; color: var(--primary); line-height: 1; margin: 10px 0 4px; }
.result-score-big span { font-size: 22px; font-weight: 500; color: var(--muted); }
.result-msg { font-size: 16px; color: var(--muted); margin: 8px 0 20px; }
.stats-chips { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 26px; }
.restart-btn { background: var(--primary); color: white; border: none; padding: 13px 32px; font-size: 18px; border-radius: 8px; cursor: pointer; font-weight: 700; transition: background 0.22s; }
.restart-btn:hover { background: var(--primary-hover); }


/* ══════════════════════════════════════════════════
   QUIZ-SPECIFIC: SQ (Short Questions)
   ══════════════════════════════════════════════════ */
.sq-section { display: flex; flex-direction: column; gap: 10px; }
.section-header {
    background: var(--section-grad);
    border-radius: 12px; padding: 14px 20px;
    display: flex; align-items: center; gap: 12px;
    box-shadow: var(--shadow);
}
.section-icon { width: 38px; height: 38px; flex-shrink: 0; background: rgba(255,255,255,0.15); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; }
.section-title { font-size: 17px; font-weight: 700; color: white; }
.section-count { font-size: 12px; color: rgba(255,255,255,0.7); margin-top: 1px; }

.sq-card {
    background: var(--card);
    border: 1.5px solid var(--type-border);
    border-radius: 12px; overflow: hidden;
    box-shadow: var(--shadow);
    transition: box-shadow 0.25s;
    animation: fadeUp 0.35s ease backwards;
    cursor: pointer;
}
.sq-card:hover { box-shadow: var(--shadow-md); }

.sq-question-row {
    padding: 14px 18px;
    display: flex; align-items: flex-start; gap: 12px;
    background: var(--type-bg);
}
.sq-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--type-dot); flex-shrink: 0; margin-top: 6px; }
.sq-number-badge {
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--type-badge); color: white;
    font-size: 11px; font-weight: 700; border-radius: 7px;
    padding: 3px 9px; flex-shrink: 0; white-space: nowrap; margin-top: 2px;
}
.sq-q-text { flex: 1; font-size: 16px; font-weight: 600; line-height: 1.5; color: var(--type-color); }
.sq-meta { display: flex; align-items: center; gap: 8px; flex-shrink: 0; margin-top: 2px; }
.sq-marks {
    font-size: 11px; font-weight: 700;
    background: rgba(255,255,255,0.55); color: var(--muted);
    border-radius: 99px; padding: 2px 9px;
}
body.dark .sq-marks { background: rgba(255,255,255,0.08); }
.sq-chevron { width: 18px; height: 18px; color: var(--muted); transition: transform 0.3s ease; flex-shrink: 0; }
.sq-card.open .sq-chevron { transform: rotate(180deg); }

.sq-answer { max-height: 0; overflow: hidden; transition: max-height 0.38s cubic-bezier(0.4,0,0.2,1); }
.sq-card.open .sq-answer { max-height: 800px; }
.sq-answer-inner {
    padding: 14px 18px 16px 40px;
    background: var(--type-ans-bg);
    border-top: 1.5px dashed var(--type-ans-bd);
    font-size: 15px; line-height: 1.8; color: var(--text);
}


/* ══════════════════════════════════════════════════
   QUIZ-SPECIFIC: CQ (Creative Questions)
   ══════════════════════════════════════════════════ */
.topic-section { display: flex; flex-direction: column; gap: 16px; }
.topic-header {
    background: var(--section-grad);
    border-radius: 12px; padding: 14px 20px;
    display: flex; align-items: center; gap: 12px;
    box-shadow: var(--shadow);
}
.topic-icon { width: 38px; height: 38px; flex-shrink: 0; background: rgba(255,255,255,0.15); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; }
.topic-title { font-size: 17px; font-weight: 700; color: white; }
.topic-count { font-size: 12px; color: rgba(255,255,255,0.7); margin-top: 1px; }

.cq-card {
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 14px; overflow: hidden;
    box-shadow: var(--shadow);
    animation: fadeUp 0.4s ease backwards;
}
.cq-card:hover { box-shadow: var(--shadow-md); }

.cq-number-bar {
    background: var(--primary-light);
    padding: 10px 20px;
    display: flex; align-items: center; justify-content: space-between;
    border-bottom: 1.5px solid var(--border);
}
.cq-number { font-size: 13px; font-weight: 700; color: var(--primary); }
.cq-total-marks { font-size: 12px; color: var(--muted); background: var(--card); border: 1px solid var(--border); padding: 2px 10px; border-radius: 99px; }

.uddipak-wrap { padding: 16px 20px; }
.uddipak-label {
    font-size: 11px; font-weight: 700; letter-spacing: 2px;
    color: var(--primary); text-transform: uppercase;
    margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
}
.uddipak-label::before { content: ''; display: inline-block; width: 14px; height: 3px; border-radius: 2px; background: var(--primary); }
.uddipak-box {
    background: var(--uddipak-bg); border: 1.5px solid var(--uddipak-border);
    border-radius: 10px; padding: 14px 16px;
    font-size: 15px; line-height: 1.75; color: var(--text);
}

.parts-divider { height: 1px; background: var(--border); margin: 0 20px; }
.parts-container { padding: 12px 16px 16px; display: flex; flex-direction: column; gap: 8px; }

.part-item { border-radius: 10px; overflow: hidden; border: 1.5px solid transparent; }
.part-item.ka  { border-color: var(--ka-border); }
.part-item.kha { border-color: var(--kha-border); }
.part-item.ga  { border-color: var(--ga-border); }
.part-item.gha { border-color: var(--gha-border); }

.part-toggle {
    width: 100%; background: none; border: none;
    padding: 11px 14px; display: flex; align-items: center; gap: 10px;
    cursor: pointer; text-align: left; border-radius: 10px;
    transition: background 0.2s;
}
.part-item.ka  .part-toggle { background: var(--ka-bg); }
.part-item.kha .part-toggle { background: var(--kha-bg); }
.part-item.ga  .part-toggle { background: var(--ga-bg); }
.part-item.gha .part-toggle { background: var(--gha-bg); }
.part-item.open .part-toggle { border-radius: 10px 10px 0 0; }
.part-toggle:hover { filter: brightness(0.96); }
body.dark .part-toggle:hover { filter: brightness(1.08); }

.part-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.part-item.ka  .part-dot { background: var(--ka-dot); }
.part-item.kha .part-dot { background: var(--kha-dot); }
.part-item.ga  .part-dot { background: var(--ga-dot); }
.part-item.gha .part-dot { background: var(--gha-dot); }

.part-badge {
    display: inline-flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: 8px;
    font-size: 14px; font-weight: 700; flex-shrink: 0;
}
.part-item.ka  .part-badge { background: var(--ka-dot);  color: white; }
.part-item.kha .part-badge { background: var(--kha-dot); color: white; }
.part-item.ga  .part-badge { background: var(--ga-dot);  color: white; }
.part-item.gha .part-badge { background: var(--gha-dot); color: white; }

.part-question { flex: 1; font-size: 15px; font-weight: 600; line-height: 1.45; }
.part-item.ka  .part-question { color: var(--ka-color); }
.part-item.kha .part-question { color: var(--kha-color); }
.part-item.ga  .part-question { color: var(--ga-color); }
.part-item.gha .part-question { color: var(--gha-color); }

.part-meta { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.marks-badge { font-size: 11px; font-weight: 700; background: rgba(255,255,255,0.55); border-radius: 99px; padding: 2px 8px; color: var(--muted); }
body.dark .marks-badge { background: rgba(255,255,255,0.08); }

.chevron { width: 18px; height: 18px; flex-shrink: 0; color: var(--muted); transition: transform 0.3s ease; }
.part-item.open .chevron { transform: rotate(180deg); }

.part-answer { max-height: 0; overflow: hidden; transition: max-height 0.38s cubic-bezier(0.4,0,0.2,1); }
.part-item.open .part-answer { max-height: 1000px; }
.answer-inner { padding: 14px 16px 14px 52px; font-size: 15px; line-height: 1.8; color: var(--text); border-top: 1px dashed var(--border); }
.answer-label { font-size: 11px; font-weight: 700; letter-spacing: 1.5px; color: var(--muted); text-transform: uppercase; margin-bottom: 6px; }

@media(max-width:600px) {
    .answer-inner { padding-left: 16px; }
    .sq-answer-inner { padding-left: 16px; }
    .part-question { font-size: 14px; }
    .sq-q-text { font-size: 15px; }
}


/* ══════════════════════════════════════════════════
   RESPONSIVE HEADER
   ══════════════════════════════════════════════════ */
@media(max-width:768px) {
    .header-nav { display: none; }
    .header-inner { padding: 10px 0; }
    .site-header { padding: 0 16px; }
    .header-left h1 { font-size: 16px; }
}
@media(max-width:480px) {
    .site-header { padding: 0 12px; }
    .header-inner { gap: 6px; }
    .dark-btn { padding: 5px 10px; font-size: 11px; }
    .header-left h1 { font-size: 14px; }
    .btn { padding: 10px 18px; font-size: 14px; }
    .btn-lg { padding: 13px 24px; font-size: 16px; }
}

/* ══════════════════════════════════════════════════
   PAGE BODY
   ══════════════════════════════════════════════════ */
.page-body {
    max-width: 960px;
    margin: 0 auto;
    padding: 28px 16px 48px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* ══════════════════════════════════════════════════
   BACK LINK UTILITY
   ══════════════════════════════════════════════════ */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255,255,255,0.72);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.2s;
    white-space: nowrap;
}
.back-link:hover {
    background: rgba(255,255,255,0.2);
    color: white;
}
.back-link svg {
    width: 14px; height: 14px;
}