:root {
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --primary-blue: #2d3436;
    --nav-pill-bg: #dfe6e9;
    --text-main: #1a1a1a;
    --text-dim: #636e72;
    --accent: #0984e3;
    --border-color: #e2e8f0;
}

.hidden {
    display: none !important;
}

body.quiz-mode {
    background-color: #ffffff;
}

body.quiz-mode .background-image {
    display: none;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.header-content {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 50px 180px 30px 60px;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
    transition: all 0.3s ease;
}

body.quiz-mode .header-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    pointer-events: auto;
}

.top-left-title {
    font-family: 'Inter', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.1;
    margin: 0;
}

.top-left-subtitle {
    font-size: 1.1rem;
    color: var(--text-dim);
    margin-top: 10px;
    font-weight: 400;
}

.pill-nav-container {
    display: flex;
    gap: 16px;
    margin-top: 15px;
    pointer-events: auto;
}

.pill-item {
    background: #cbd5e1;
    color: #334155;
    padding: 12px 28px;
    border-radius: 40px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #94a3b8;
}

.pill-item.active {
    background: #334155;
    color: white;
    border-color: #1e293b;
    box-shadow: 0 4px 10px rgba(51, 65, 85, 0.4);
}

.pill-item:hover {
    background: #94a3b8;
    color: #0f172a;
}

/* Background Image backdrop (Framed) */
.background-image {
    display: block;
    position: fixed;
    top: 180px;
    /* Room for the title */
    left: 60px;
    right: 60px;
    bottom: 40px;
    z-index: -1;
    background-image: url('Whisk_d631f1af4942618b8c2477a2dc58d973dr.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
    opacity: 1;
    /* Restore full opacity since overlay/blur is handled by cards */
    filter: none;
    /* Restore original clarity */
}

@keyframes move {
    from {
        transform: translate(0, 0);
    }

    to {
        transform: translate(100px, 100px);
    }
}

/* Layout */
.container {
    width: 98%;
    max-width: 1800px;
    padding: 180px 20px 60px 20px;
    animation: fadeIn 0.8s ease-out;
    position: relative;
    margin: 0 auto;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.glow-text {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    letter-spacing: 4px;
    background: linear-gradient(90deg, var(--primary-glow), var(--secondary-glow));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(0, 242, 255, 0.3);
}

.subtitle {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-top: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Category selection grid - 8 Cards (2 columns x 4 rows) */
.selection-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, auto);
    grid-auto-flow: column;
    gap: 40px;
    margin: 30px auto;
}

.category-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    padding: 35px 120px;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.1);
}

.category-card:hover {
    background: #ffffff;
    transform: translateX(5px);
}

.card-content {
    flex: 1;
}

.card-icon-orb {
    width: 50px;
    height: 50px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dim);
    margin-left: 20px;
    position: relative;
}

.card-icon-orb::before {
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    background: var(--text-main);
    border-radius: 50%;
    left: -20px;
    opacity: 0.1;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.card-desc {
    font-size: 1.1rem;
    color: var(--text-dim);
    line-height: 1.4;
}

.quiz-header-nav {
    position: fixed;
    top: 50px;
    right: 80px;
    display: flex;
    gap: 8px;
    z-index: 100;
}

.category-nav {
    display: flex;
    gap: 8px;
    background: #eeeeee;
    padding: 5px;
    border-radius: 30px;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
    font-weight: 600;
}

.nav-btn.active {
    background: #4a5568;
    color: white;
}

/* Question Area */
#question-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    min-height: 300px;
}

.question-card {
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.question-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.q-text {
    font-size: 1.1rem;
    line-height: 1.5;
    margin-bottom: 20px;
    font-weight: 600;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: auto;
}

.option-btn {
    background: #ffffff;
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 15px;
    border-radius: 10px;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.option-btn:hover {
    background: #f8f9fa;
    border-color: var(--primary-glow);
    transform: translateX(5px);
}

.explanation-box {
    margin-top: 20px;
    padding: 15px;
    background-color: #f1f8ff;
    border-left: 4px solid #007bff;
    border-radius: 4px;
    font-size: 0.95rem;
    color: #333;
    line-height: 1.5;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.option-btn.correct {
    background: rgba(0, 255, 136, 0.2) !important;
    border-color: var(--success) !important;
    color: var(--success);
    animation: successPulse 0.5s ease;
}

@keyframes successPulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.02);
    }

    100% {
        transform: scale(1);
    }
}

.option-btn.wrong {
    background: rgba(255, 77, 77, 0.2) !important;
    border-color: var(--error) !important;
    color: var(--error);
}

.pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin: 40px 0;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

#page-indicator {
    font-weight: 700;
    color: var(--text-main);
}

.main-menu-container {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    margin: 20px 0;
}

.main-menu-card {
    background: #0f172a;
    border: none;
    border-radius: 18px;
    padding: 22px 35px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    width: auto;
    min-width: 250px;
}

.main-menu-card:hover {
    transform: translateY(-4px) scale(1.02);
    background: #1e293b;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.back-arrow {
    color: #3b82f6;
    font-size: 1.1rem;
    font-weight: 400;
}

.menu-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.menu-title {
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
    margin-bottom: 2px;
}

.menu-subtitle {
    color: #94a3b8;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

/* Footer */
footer {
    border-top: 1px solid var(--glass-border);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats {
    font-weight: 600;
    color: var(--primary-glow);
}

#reset-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-dim);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.8rem;
}

#reset-btn:hover {
    color: var(--error);
    border-color: var(--error);
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    .glow-text {
        font-size: 1.8rem;
    }

    .category-nav {
        flex-direction: column;
    }
}