:root {
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --text-light: #1e293b;
    --text-dark: #e2e8f0;
    --card-bg-light: rgba(255, 255, 255, 0.7);
    --card-bg-dark: rgba(30, 41, 59, 0.7);
    --border-light: rgba(226, 232, 240, 0.8);
    --border-dark: rgba(51, 65, 85, 0.8);
    --primary-color: #f97316;
    --primary-hover: #ea580c;
    --secondary-color: #3b82f6;
    --secondary-hover: #2563eb;
    --muted-color-light: #64748b;
    --muted-color-dark: #94a3b8;
    --gradient-start: #3b82f6;
    --gradient-end: #a855f7;
    --gradient-start-dark: #60a5fa;
    --gradient-end-dark: #c084fc;
    --success-color: #22c55e;
    --success-hover: #16a34a;
}

html {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
    line-height: 1.6;
}

html.dark {
    color-scheme: dark;
}

body {
    background-color: var(--bg-light);
    color: var(--text-light);
    background-image: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    margin: 0;
    transition: background-color 0.5s, color 0.5s, background-image 0.5s;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.dark body {
    background-color: var(--bg-dark);
    color: var(--text-dark);
    background-image: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
}

#app-container {
    position: relative;
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
}

.page-section {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    box-sizing: border-box;
    will-change: transform, opacity;
}

.page-section.hidden {
    display: none;
}

.dark-mode-toggle-container {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 50;
}

.dark-mode-toggle {
    padding: 0.5rem;
    border-radius: 9999px;
    background-color: rgba(226, 232, 240, 0.5);
    border: none;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: background-color 0.2s;
}
.dark .dark-mode-toggle {
    background-color: rgba(30, 41, 59, 0.5);
}
.dark-mode-toggle:hover {
    background-color: rgba(203, 213, 225, 0.8);
}
.dark .dark-mode-toggle:hover {
    background-color: rgba(51, 65, 85, 0.8);
}
.dark-mode-toggle .icon-moon { display: none; }
.dark .dark-mode-toggle .icon-moon { display: block; }
.dark .dark-mode-toggle .icon-sun { display: none; }


.home-content {
    text-align: center;
    max-width: 42rem;
    margin: 0 auto;
}

.home-title {
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background-image: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.dark .home-title {
    background-image: linear-gradient(to right, var(--gradient-start-dark), var(--gradient-end-dark));
}

.home-subtitle {
    font-size: clamp(1.1rem, 3vw, 1.25rem);
    color: var(--muted-color-light);
    margin-bottom: 2rem;
}
.dark .home-subtitle {
    color: var(--muted-color-dark);
}

.home-description {
    margin-bottom: 3rem;
    color: var(--muted-color-light);
}
.dark .home-description {
    color: var(--muted-color-dark);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    color: white;
}

.btn-primary {
    background-color: var(--primary-color);
    padding: 0.75rem 3rem;
    font-size: 1.125rem;
    box-shadow: 0 4px 14px 0 rgba(249, 115, 22, 0.39);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(249, 115, 22, 0.45);
}

.quiz-container {
    width: 100%;
    max-width: 42rem;
}

.progress-container {
    width: 100%;
    background-color: var(--border-light);
    border-radius: 9999px;
    height: 0.625rem;
    margin-bottom: 1rem;
}
.dark .progress-container {
    background-color: var(--border-dark);
}

.progress-bar {
    background-image: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    height: 100%;
    border-radius: 9999px;
    transition: width 0.5s ease;
}

.question-counter {
    text-align: center;
    font-size: 0.875rem;
    color: var(--muted-color-light);
    margin-bottom: 1.5rem;
}
.dark .question-counter {
    color: var(--muted-color-dark);
}

.card {
    background-color: var(--card-bg-light);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 1px solid var(--border-light);
}
.dark .card {
    background-color: var(--card-bg-dark);
    border-color: var(--border-dark);
}

.question-card {
    padding: 1.5rem;
}

.question-text {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
}

.options-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.option-button {
    display: block;
    width: 100%;
    padding: 1rem;
    text-align: left;
    border-radius: 0.75rem;
    background-color: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.2s ease-in-out;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-light);
}
.dark .option-button {
    background-color: rgba(55, 65, 81, 0.5);
    border-color: rgba(75, 85, 99, 0.5);
    color: var(--text-dark);
}
.option-button:hover {
    background-color: rgba(255, 255, 255, 0.8);
    transform: translateY(-4px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.dark .option-button:hover {
    background-color: rgba(75, 85, 99, 0.8);
}


.result-card {
    width: 100%;
    max-width: 56rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.result-image-container {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: rgba(241, 245, 249, 0.5);
    border-bottom: 1px solid var(--border-light);
}
.dark .result-image-container {
    background-color: rgba(15, 23, 42, 0.5);
    border-bottom-color: var(--border-dark);
}

.result-image {
    width: 100%;
    max-width: 24rem;
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
}

.result-name {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    background-image: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.dark .result-name {
    background-image: linear-gradient(to right, var(--gradient-start-dark), var(--gradient-end-dark));
}

.result-title {
    color: var(--muted-color-light);
    text-align: center;
    margin-top: 0.25rem;
}
.dark .result-title {
    color: var(--muted-color-dark);
}

.result-details-container {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.prose {
    flex-grow: 1;
    max-width: none;
}
.dark .prose {
    color: var(--text-dark);
}
.prose h3 {
    font-weight: 700;
    color: var(--primary-color);
}
.prose ul {
    padding-left: 1rem;
}
.prose li {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.result-actions {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}
.dark .result-actions {
    border-top-color: var(--border-dark);
}

.btn-share {
    background-color: var(--secondary-color);
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}
.btn-share:hover {
    background-color: var(--secondary-hover);
}
.btn-share.copied {
    background-color: var(--success-color);
}
.btn-share.copied:hover {
    background-color: var(--success-hover);
}

.btn-retake {
    background-color: #475569;
}
.btn-retake:hover {
    background-color: #334155;
}

.btn .icon {
    width: 1rem;
    height: 1rem;
}


@media (min-width: 768px) {
    .options-container {
        grid-template-columns: 1fr 1fr;
    }

    .question-card {
        padding: 2rem;
    }

    .question-text {
        font-size: 1.5rem;
    }
    
    .result-card {
        flex-direction: row;
    }
    
    .result-image-container {
        width: 50%;
        padding: 2rem;
        border-bottom: none;
        border-right: 1px solid var(--border-light);
    }
    
    .dark .result-image-container {
        border-right-color: var(--border-dark);
    }
    
    .result-details-container {
        width: 50%;
        padding: 2rem;
    }

    .result-name {
        font-size: 2.25rem;
    }
}