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

:root {
    --primary-color: #008A05;
    --primary-hover: #006B04;
    --primary-light: #E8F5E9;
    --text-primary: #222222;
    --text-secondary: #717171;
    --border-color: #DDDDDD;
    --background: #FFFFFF;
    --background-secondary: #F7F7F7;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    position: sticky;
    top: 16px;
    width: calc(100% - 48px);
    max-width: 640px;
    margin: 16px auto 0 auto;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    letter-spacing: -0.01em;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Search */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.search-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

.search-container.active .search-toggle {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.search-input {
    width: 0;
    padding: 0;
    font-size: 0.875rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-primary);
    transition: all 0.3s ease;
    opacity: 0;
}

.search-container.active .search-input {
    width: 180px;
    padding: 6px 12px;
    border-color: var(--border-color);
    background: var(--background-secondary);
    opacity: 1;
    margin-right: 8px;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--background);
}

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

.search-results {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    width: 280px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    max-height: 300px;
    overflow-y: auto;
    display: none;
    z-index: 200;
}

.search-results.active {
    display: block;
}

.search-result-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-primary);
}

.search-result-item:hover {
    background: var(--background-secondary);
}

.search-result-item:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.search-result-image {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    object-fit: cover;
    margin-right: 10px;
    background: var(--background-secondary);
}

.search-result-info {
    flex: 1;
    min-width: 0;
}

.search-result-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-result-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: capitalize;
}

.search-no-results {
    padding: 16px 12px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.lang-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

.tagline {
    display: none;
}

/* Main Content */
main {
    flex: 1;
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 48px 24px 56px;
    margin-bottom: 32px;
}

.hero h2 {
    font-family: 'Cormorant Unicase', serif;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Marquee */
.marquee-wrapper {
    margin-top: 48px;
    perspective: 800px;
    overflow: clip;
    overflow-clip-margin: 20px;
    margin-left: -24px;
    margin-right: -24px;
    -webkit-mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
    mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
}

.marquee-track {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    animation: marquee 30s linear infinite;
    transform: rotateX(10deg);
    transform-origin: center center;
}

.marquee-card {
    flex-shrink: 0;
    width: 200px;
    height: 150px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--background-secondary);
}

.marquee-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@keyframes marquee {
    0% {
        transform: rotateX(10deg) translateX(0);
    }
    100% {
        transform: rotateX(10deg) translateX(-50%);
    }
}

/* Section Headers */
.section-header {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.section-header:not(:first-child) {
    margin-top: 16px;
}

/* Featured Quizzes */
.featured-quiz {
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.featured-quiz:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.featured-content {
    display: flex;
    align-items: center;
}

.featured-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 16px;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary-color);
    flex-shrink: 0;
}

.featured-info {
    flex: 1;
}

.featured-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.featured-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 2px;
    display: block;
}

.featured-score {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 4px 10px;
    border-radius: 20px;
}

.featured-score.perfect {
    background: var(--primary-color);
    color: white;
}


/* Category List */
.category-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.category {
    background: var(--background);
}

.category-header {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 0 0 16px 0;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
}

.lesson-list {
    list-style: none;
}

.lesson-item {
    display: flex;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

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

.lesson-item:hover {
    background: transparent;
}

.lesson-item:hover .lesson-label {
    color: var(--primary-color);
}

.lesson-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 16px;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    flex-shrink: 0;
}

.lesson-info {
    flex: 1;
    min-width: 0;
}

.lesson-label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    display: block;
    transition: var(--transition);
}

.lesson-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.lesson-score {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--primary-light);
    padding: 4px 10px;
    border-radius: 20px;
    margin-right: 12px;
}

.lesson-score.perfect {
    background: var(--primary-color);
    color: white;
}

.lesson-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: none;
    padding: 0;
    font-weight: 400;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: none;
}

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--text-primary);
}

.btn-secondary:hover {
    background: var(--background-secondary);
    transform: none;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Footer */
footer {
    background: var(--background-secondary);
    border-top: 1px solid var(--border-color);
    padding: 24px;
    margin-top: auto;
}

footer p {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    main {
        padding: 24px 16px 48px;
    }

    .hero {
        padding: 32px 16px 40px;
    }

    .hero h2 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .btn {
        width: 100%;
    }

    .search-container.active .search-input {
        width: 120px;
        padding: 6px 10px;
        font-size: 0.8125rem;
    }

    .search-results {
        width: 200px;
    }

    .search-toggle,
    .lang-toggle {
        width: 30px;
        height: 30px;
    }
}