:root {
    /* Colors - High Contrast Logic */
    --color-bg: #050505;
    --color-surface: #111111;
    --color-text: #ffffff;
    --color-text-dim: #a0a0a0;
    --color-primary: #00ff66; /* Electric Green */
    --color-secondary: #0070f3; /* Deep Blue */
    --color-wrong: #ff3e3e;
    --color-correct: #00ff66;
    --color-border: #333333;
    
    /* Typography */
    --font-main: 'Plus Jakarta Sans', sans-serif;
    --font-title: 'Outfit', sans-serif;
    --font-mono: 'Space Grotesk', monospace;
    
    /* Layout */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    --border-width: 1px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    border-radius: 0 !important; /* NO ROUNDED CORNERS - ORBAN CONSULT LAW */
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.app-container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Page Transitions */
.page {
    display: none;
    opacity: 0;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    flex-grow: 1;
}

.page.active {
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.5s forwards;
}

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

/* Typography Defaults */
h1, h2, h3, h4 {
    font-family: var(--font-title);
    text-transform: uppercase;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 1.25rem 2.5rem;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    border: var(--border-width) solid transparent;
    border-radius: 0;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

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

.btn.primary:disabled {
    background-color: #333;
    color: #666;
    cursor: not-allowed;
}

.btn.secondary {
    background-color: transparent;
    border-color: var(--color-border);
    color: var(--color-text);
}

.btn svg {
    width: 1.2rem;
    height: 1.2rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    transition: transform 0.3s;
}

@media (hover: hover) {
    .btn.primary:hover {
        background-color: var(--color-primary);
        color: var(--color-bg);
    }
    .btn.secondary:hover {
        border-color: var(--color-text);
        background-color: rgba(255, 255, 255, 0.05);
    }
    .btn:hover svg {
        transform: translateX(5px);
    }
}

/* Hero Section */
.hero {
    padding: var(--spacing-lg) 0;
    border-bottom: var(--border-width) solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.hero-content {
    max-width: 800px;
}

h1.glitch-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    line-height: 0.9;
    margin-bottom: var(--spacing-md);
}

/* Modes Selection */
.modes-selection {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.mode-card {
    border: var(--border-width) solid var(--color-border);
    padding: var(--spacing-md);
    transition: border-color 0.3s;
}

@media (hover: hover) {
    .mode-card:hover {
        border-color: var(--color-primary);
    }
}

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

@media (hover: hover) {
    .btn.primary:hover {
        background-color: var(--color-primary);
        color: var(--color-bg);
    }
    .btn.secondary:hover {
        border-color: var(--color-text);
        background-color: rgba(255, 255, 255, 0.05);
    }
    .mode-card:hover {
        border-color: var(--color-primary);
    }
    .answer-btn:hover:not(:disabled) {
        border-color: var(--color-text);
        background: #1a1a1a;
    }
    .chapter-item:hover:not(.disabled) {
        border-color: var(--color-text-dim);
        background: rgba(255, 255, 255, 0.03);
    }
}

/* Active states for touch devices */
.answer-btn:active:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(0.98);
}

.btn:active:not(:disabled) {
    transform: translateY(2px);
}

.card-inner {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.card-header .number {
    font-family: var(--font-mono);
    color: var(--color-text-dim);
    font-size: 1rem;
}

.mode-card h2 {
    font-size: 1.5rem;
}

.mode-card p {
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.selector-group {
    margin-bottom: var(--spacing-md);
}

.selector-group label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-dim);
}

.custom-select {
    position: relative;
}

.custom-select select {
    width: 100%;
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border);
    color: var(--color-text);
    padding: 1rem;
    font-family: var(--font-main);
    border-radius: 0;
    appearance: none;
    cursor: pointer;
}

.custom-select::after {
    content: '↓';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
}

/* Quiz UI */
.quiz-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.back-link {
    background: none;
    border: none;
    color: var(--color-text-dim);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.8rem;
    cursor: pointer;
}

.back-link svg {
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
}

.back-link:hover {
    color: var(--color-text);
}

#current-chapter-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-primary);
}

.progress-info {
    font-family: var(--font-mono);
    font-weight: 700;
}

.progress-info .current {
    font-size: 1.2rem;
}

.progress-info .divider {
    color: var(--color-border);
    margin: 0 0.2rem;
}

.progress-info .total {
    color: var(--color-text-dim);
}

.progress-bar-container {
    width: 100%;
    height: 2px;
    background-color: var(--color-border);
    margin: var(--spacing-md) 0 var(--spacing-lg);
}

.progress-bar {
    height: 100%;
    background-color: var(--color-primary);
    width: 0%;
    transition: width 0.3s ease;
}

.quiz-content {
    max-width: 800px;
    margin: 0 auto;
}

.question-text {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.answers-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.answer-btn {
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border);
    color: var(--color-text);
    padding: 1.5rem;
    text-align: left;
    font-family: var(--font-main);
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (hover: hover) {
    .answer-btn:hover:not(:disabled) {
        border-color: var(--color-text);
        background: #1a1a1a;
    }
}

.answer-btn:active:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(0.98);
}

.answer-btn:disabled {
    cursor: default;
    opacity: 0.7;
}

.answer-btn.correct {
    border-color: var(--color-correct) !important;
    background: rgba(0, 255, 102, 0.1) !important;
}

.answer-btn.wrong {
    border-color: var(--color-wrong) !important;
    background: rgba(255, 62, 62, 0.1) !important;
}

.answer-btn .status-icon {
    font-size: 1.2rem;
}

/* Feedback Section */
.feedback-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    border: var(--border-width) solid var(--color-border);
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.feedback-status {
    margin-bottom: var(--spacing-sm);
}

#feedback-title {
    font-size: 1.2rem;
}

.feedback-explanation {
    margin-bottom: var(--spacing-md);
}

.source-container {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: var(--border-width) dashed var(--color-border);
}

.source-container h4 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

#source-text {
    font-family: var(--font-main);
    font-style: italic;
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 4px solid var(--color-primary);
    background: rgba(0, 255, 102, 0.05);
}

.quiz-actions {
    margin-top: var(--spacing-lg);
    display: flex;
    justify-content: flex-end;
}

/* Results UI */
.results-container {
    text-align: center;
    max-width: 600px;
    margin: var(--spacing-lg) auto;
}

.results-header h1 {
    font-size: 6rem;
    line-height: 1;
    margin-bottom: 0;
}

.percentage {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.result-message {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    padding: var(--spacing-md);
    border: var(--border-width) solid var(--color-border);
}

.stat-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-dim);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
}

.stat-value.correct { color: var(--color-correct); }
.stat-value.wrong { color: var(--color-wrong); }

.results-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Chapter Grid Selection */
.chapters-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    max-height: 400px;
    overflow-y: auto;
    padding-right: 5px;
}

/* Scrollbar styling */
.chapters-grid::-webkit-scrollbar {
    width: 4px;
}
.chapters-grid::-webkit-scrollbar-track {
    background: var(--color-bg);
}
.chapters-grid::-webkit-scrollbar-thumb {
    background: var(--color-border);
}

.chapter-item {
    display: grid;
    grid-template-columns: 40px 1fr;
    align-items: center;
    padding: 1.25rem 1rem;
    border: var(--border-width) solid var(--color-border);
    cursor: pointer;
    transition: all 0.2s ease;
    background: transparent;
}

@media (hover: hover) {
    .chapter-item:hover:not(.disabled) {
        border-color: var(--color-text-dim);
        background: rgba(255, 255, 255, 0.03);
    }
}

.chapter-item:active:not(.disabled) {
    background: rgba(255, 255, 255, 0.05);
}

.chapter-item.selected {
    border-color: var(--color-primary);
    background: rgba(0, 255, 102, 0.1);
    box-shadow: inset 4px 0 0 var(--color-primary);
}

.chapter-item.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-style: dashed;
}

.ch-num {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

.ch-name {
    font-family: var(--font-title);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.ch-status {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-align: right;
    letter-spacing: 0.1em;
}

.chapter-item.selected .ch-num,
.chapter-item.selected .ch-name {
    color: var(--color-primary);
}

/* Mobile Ready & Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2.5rem;
        --spacing-xl: 4rem;
    }

    .page {
        padding: var(--spacing-sm);
    }

    h1.glitch-title {
        font-size: 2.5rem;
        line-height: 1;
        letter-spacing: -0.01em;
    }

    .modes-selection {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .mode-card {
        padding: var(--spacing-sm);
    }

    .chapters-grid {
        max-height: 300px;
    }

    .chapter-item {
        grid-template-columns: 35px 1fr;
        padding: 1rem;
    }

    .ch-status {
        display: none;
    }

    .question-text {
        font-size: 1.4rem;
        margin-bottom: var(--spacing-md);
    }

    .answer-btn {
        padding: 1.2rem 1rem;
        font-size: 1rem;
    }

    .feedback-container {
        padding: var(--spacing-sm);
    }

    #source-text {
        font-size: 1rem;
        padding: var(--spacing-sm);
    }

    .results-header h1 {
        font-size: 4rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-md) 0;
    }

    .label {
        font-size: 0.65rem;
    }

    .btn {
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 0.8rem;
    }

    .quiz-nav {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }

    .nav-right {
        width: 100%;
        display: flex;
        justify-content: flex-end;
    }

    #current-chapter-title {
        font-size: 0.65rem;
    }

    .results-header h1 {
        font-size: 3.5rem;
    }
}

/* Footer */
.site-footer {
    margin-top: auto;
    padding: var(--spacing-md);
    border-top: var(--border-width) solid var(--color-border);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-dim);
    letter-spacing: 0.05em;
}

.site-footer a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.site-footer a:hover {
    color: var(--color-text);
}

/* Utilities */
.hidden { display: none !important; }