:root {
    --color-bg: #f4f6f9;          
    --color-text: #2c3e50;        
    --color-primary: #3498db;     
    --color-secondary: #ffffff;   
    --color-border: #d0d3d4;      
    --color-shadow: rgba(52, 152, 219, 0.18); 
    --transition-speed: 0.5s;
    --font-serif: 'Roboto Slab', serif;
    --font-sans: 'Montserrat', sans-serif;
    --header-height: 7rem; 
}

.dark-mode {
    --color-bg: #1f272e;
    --color-text: #ecf0f1;
    --color-primary: #f39c12;     
    --color-secondary: #2c3e3e;   
    --color-border: #44515f;
    --color-shadow: rgba(0, 0, 0, 0.5);
}

html { font-size: 62.5%; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color var(--transition-speed) ease-in-out, color var(--transition-speed) ease-in-out; 
    font-size: 1.6rem; 
    line-height: 1.6;
}
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s;
}
a:hover { filter: brightness(1.2); }

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height); 
    padding: 0 3vw; 
    background-color: var(--color-secondary);
    box-shadow: 0 0.4rem 1.5rem var(--color-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo a {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem); 
    font-weight: 800;
    color: var(--color-text);
    text-transform: uppercase;
}

.main-nav ul { display: flex; gap: 3rem; }
.main-nav a {
    padding-bottom: 0.5rem;
    font-weight: 600;
    position: relative;
}
.header-controls { display: flex; gap: 1rem; }

.control-btn {
    background: var(--color-primary);
    color: var(--color-secondary);
    border: none;
    padding: 0.8rem 1.2rem;
    border-radius: 0.8rem;
    cursor: pointer;
    font-size: 1.4rem;
    font-weight: bold;
    transition: transform 0.2s, box-shadow 0.2s;
}
.control-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-0.2rem);
    box-shadow: 0 0.4rem 0.8rem var(--color-shadow);
}
.control-btn:active { transform: translateY(0); box-shadow: none; }

@media (max-width: 600px) {
    .main-nav { display: none; }
    .main-header { justify-content: space-around; }
    .logo a { font-size: clamp(2rem, 5vw, 2.5rem); }
}


.quiz-main-section {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; 
    padding: 3rem 5vw;
    text-align: center;
}

.quiz-main-section h2 {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 6vw, 4rem);
    margin-bottom: 4rem;
    color: var(--color-text);
}

.quiz-container {
    max-width: 90rem; 
    width: 100%;
    padding: 4rem;
    background-color: var(--color-secondary);
    border-radius: 1.5rem;
    box-shadow: 0 0.8rem 2.5rem var(--color-shadow); 
    opacity: 0; 
    transform: scale(0.9);
    animation: fadeInScale 1s forwards ease-out 0.2s;
}

@keyframes fadeInScale {
    to {
        opacity: 1;
        transform: scale(1);
    }
}


#question-text {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 3.5vw, 2.8rem);
    margin: 3rem 0;
    min-height: 5rem;
}

.question-info {
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    font-size: 1.4rem;
}

.answers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); 
    gap: 1.5rem;
    margin-top: 3rem;
}

.answer-btn {
    width: 100%;
    padding: 1.8rem 2rem;
    background-color: var(--color-bg);
    color: var(--color-text);
    border: 0.2rem solid var(--color-border);
    border-radius: 1rem;
    cursor: pointer;
    text-align: left;
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.answer-btn:hover:not(:disabled) {
    background-color: var(--color-primary);
    color: var(--color-secondary);
    border-color: var(--color-primary);
    transform: translateY(-0.4rem) scale(1.02); 
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.answer-btn.correct { background-color: #27ae60; color: white; border-color: #27ae60; }
.answer-btn.wrong { background-color: #e74c3c; color: white; border-color: #e74c3c; }

#results-area { padding: 4rem 0; }
#results-area h3 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    color: var(--color-primary);
    margin-bottom: 2rem;
}

.cta-button {
    padding: 1.2rem 3rem;
    background-color: var(--color-primary);
    color: var(--color-secondary);
    border: none;
    border-radius: 0.8rem;
    font-weight: bold;
    transition: transform 0.3s, background-color 0.3s;
    margin-top: 1rem;
}
.cta-button:hover {
    filter: brightness(1.1);
    transform: translateY(-0.2rem);
}
.hidden { display: none !important; }

.slide-up {
    opacity: 0;
    transform: translateY(2rem);
    transition: opacity 0.8s cubic-bezier(0.215, 0.61, 0.355, 1), transform 0.8s cubic-bezier(0.215, 0.61, 0.355, 1);
}
.slide-up.in-view {
    opacity: 1;
    transform: translateY(0);
}

:root {
    --color-bg: #f4f6f9;          
    --color-text: #2c3e50;        
    --color-primary: #3498db;     
    --color-secondary: #ffffff;   
    --color-border: #d0d3d4;      
    --color-shadow: rgba(52, 152, 219, 0.18);
    --transition-speed: 0.5s;
    --font-serif: 'Roboto Slab', serif;
    --font-sans: 'Montserrat', sans-serif;
    --header-height: 7rem;
}
.dark-mode {
    --color-bg: #1f272e;
    --color-text: #ecf0f1;
    --color-primary: #f39c12;
    --color-secondary: #2c3e3e;
    --color-border: #44515f;
    --color-shadow: rgba(0, 0, 0, 0.5);
}
.quiz-main-section {
    min-height: calc(100vh - var(--header-height) - 7rem); 
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 5vw;
    text-align: center;
}
.detailed-info {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--color-text);
}


.main-footer {
    background-color: var(--color-secondary);
    padding: 1.5rem 3vw;
    text-align: center;
    border-top: 0.1rem solid var(--color-border);
    transition: background-color var(--transition-speed);
}

.footer-copy, .footer-creator {
    font-size: 1.2rem; 
    color: #95a5a6; 
    margin: 0.5rem 0;
}
.dark-mode .footer-copy, .dark-mode .footer-creator {
    color: #7f8c8d;
}