/* Reset and base styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #0a0a0a;
    --color-text: #f5f5f5;
    --color-text-muted: #a0a0a0;
    --color-accent: #4a9b8c;
    --color-overlay: rgba(10, 10, 10, 0.75);
    --color-overlay-dark: rgba(10, 10, 10, 0.85);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Quiz Overlay */
.quiz-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-color: var(--color-bg);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

.quiz-overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 10, 0.5);
}

.quiz-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.quiz-container {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
}

/* Quiz progress dots */
.quiz-progress {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transition: all var(--transition-fast);
}

.progress-dot.active {
    background: var(--color-text);
}

.progress-dot.completed {
    background: var(--color-accent);
}

.quiz-question {
    display: none;
    animation: fadeIn 0.4s ease;
}

.quiz-question.active {
    display: block;
}

.quiz-question h2 {
    font-size: clamp(1.5rem, 5vw, 2.25rem);
    font-weight: 500;
    margin-bottom: 2rem;
    line-height: 1.3;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media (min-width: 480px) {
    .quiz-options {
        flex-direction: row;
        justify-content: center;
        gap: 1.5rem;
    }
}

.quiz-btn {
    background: transparent;
    border: 2px solid var(--color-text);
    color: var(--color-text);
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-family: var(--font-family);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 180px;
}

.quiz-btn:hover {
    background: var(--color-text);
    color: var(--color-bg);
}

.quiz-btn:disabled {
    cursor: default;
    opacity: 0.6;
}

.quiz-btn.correct {
    border-color: #22c55e;
    background: #22c55e;
    color: var(--color-bg);
}

.quiz-btn.wrong {
    border-color: #ef4444;
    background: #ef4444;
    color: var(--color-text);
}

.quiz-feedback {
    margin-top: 1.5rem;
    font-size: 1.25rem;
    font-weight: 500;
    min-height: 2rem;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.quiz-feedback.visible {
    opacity: 1;
}

.quiz-result {
    display: none;
    animation: fadeIn 0.4s ease;
}

.quiz-result.active {
    display: block;
}

.result-message {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    margin-bottom: 2rem;
    line-height: 1.4;
}

.enter-btn {
    background: var(--color-accent);
    border: none;
    color: var(--color-text);
    padding: 1rem 3rem;
    font-size: 1.125rem;
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.enter-btn:hover {
    background: #5bb5a4;
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.main-content.visible {
    opacity: 1;
}

/* Sections */
.section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.section-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-color: var(--color-bg);
}

.section-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Section-specific overlay opacities (adjust as needed) */
.intro-section .section-bg::after {
    background: rgba(10, 10, 10, 0.7);
}

.links-section .section-bg::after {
    background: rgba(10, 10, 10, 0.5);
}

.contact-section .section-bg::after {
    background: rgba(10, 10, 10, 0.5);
}

.section-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2.5rem 3rem;
    max-width: 800px;
    background: rgba(10, 10, 10, 0.55);
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

/* Intro Section */
.intro-section h1 {
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.intro-section .tagline {
    font-size: clamp(1rem, 3vw, 1.5rem);
    color: var(--color-text-muted);
    max-width: 500px;
    margin: 0 auto;
}

/* Links Section */
.links-section h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 500;
    margin-bottom: 2.5rem;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

@media (min-width: 600px) {
    .links-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 500px;
        gap: 1.5rem;
    }
}

@media (min-width: 900px) {
    .links-grid {
        grid-template-columns: repeat(5, 1fr);
        max-width: 700px;
    }
}

.link-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 1rem;
    text-decoration: none;
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.3);
    transition: all var(--transition-fast);
}

.link-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-4px);
}

.link-icon {
    width: 32px;
    height: 32px;
}

.link-item span {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Contact Section */
.contact-section h2 {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 500;
    margin-bottom: 1rem;
}

.contact-section p {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.contact-btn {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-text);
    text-decoration: none;
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.contact-btn:hover {
    background: #5bb5a4;
    transform: translateY(-2px);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Lazy loading for background images */
.section-bg {
    opacity: 0;
    transition: opacity 0.6s ease;
}

.section-bg.loaded {
    opacity: 1;
}

/* Focus styles for accessibility */
.quiz-btn:focus,
.enter-btn:focus,
.link-item:focus,
.contact-btn:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Responsive background images */

/* Mobile (default - smaller files for mobile-first) */
.quiz-overlay {
    background-image: url('images/quiz-bg-mobile.jpg');
}

.intro-section .section-bg {
    background-image: url('images/intro-bg-mobile.jpg');
}

.links-section .section-bg {
    background-image: url('images/links-bg-mobile.jpg');
}

.contact-section .section-bg {
    background-image: url('images/contact-bg-mobile.jpg');
}

/* Desktop (larger screens) */
@media (min-width: 768px) {
    .quiz-overlay {
        background-image: url('images/quiz-bg-desktop.jpg');
    }

    .intro-section .section-bg {
        background-image: url('images/intro-bg-desktop.jpg');
    }

    .links-section .section-bg {
        background-image: url('images/links-bg-desktop.jpg');
    }

    .contact-section .section-bg {
        background-image: url('images/contact-bg-desktop.jpg');
    }
}