/* ===== ШРИФТЫ ===== */
@font-face {
    font-family: 'RussianRail G Pro';
    src: url('fonts/RussianRailGPro.woff2') format('woff2'),
         url('fonts/RussianRailGPro.woff') format('woff'),
         url('fonts/RussianRailGPro.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'RussianRail G Pro';
    src: url('fonts/RussianRailGPro-Bold.woff2') format('woff2'),
         url('fonts/RussianRailGPro-Bold.woff') format('woff'),
         url('fonts/RussianRailGPro-Bold.ttf') format('truetype');
    font-weight: bold;
    font-style: normal;
}

/* ===== CSS ПЕРЕМЕННЫЕ ===== */
:root {
    /* Цвета РЖД */
    --rzd-red: #E21A1A;
    --rzd-red-dark: #B81414;
    --rzd-red-light: #FF3333;
    --rzd-gray-dark: #2D2D2D;
    --rzd-gray: #4A4A4A;
    --rzd-gray-light: #F5F5F5;
    --rzd-white: #FFFFFF;
    --rzd-black: #1A1A1A;
    
    /* Дополнительные */
    --warning-yellow: #FFB800;
    --success-green: #28A745;
    
    /* Типографика */
    --font-primary: 'RussianRail G Pro', 'Arial', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Отступы */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;
    
    /* Переходы */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    
    /* Тени */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
}

/* ===== СБРОС И БАЗОВЫЕ СТИЛИ ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--rzd-gray-dark);
    background-color: var(--rzd-white);
    min-height: 100vh;
}

/* ===== КОНТЕЙНЕР ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== ШАПКА ===== */
.header {
    background: var(--rzd-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--rzd-red);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--rzd-gray-dark);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--rzd-red);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.logo-lines {
    width: 24px;
    height: 3px;
    background: var(--rzd-white);
    position: relative;
}

.logo-lines::before,
.logo-lines::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: inherit;
}

.logo-lines::before { top: -8px; }
.logo-lines::after { bottom: -8px; }

.logo-text {
    font-size: 1.25rem;
    font-weight: bold;
    letter-spacing: 0.5px;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--rzd-gray);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--rzd-red);
}

.nav-link.active {
    color: var(--rzd-red);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -14px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--rzd-red);
}

/* ===== КНОПКИ ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: bold;
    text-decoration: none;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-base);
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--rzd-red-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-white:hover {
    background: var(--rzd-gray-light);
    transform: translateY(-2px);
}

/* ===== HERO СЕКЦИЯ ===== */
.hero {
    background: linear-gradient(135deg, var(--rzd-red) 0%, var(--rzd-red-dark) 100%);
    color: var(--rzd-white);
    padding: var(--spacing-xxl) 0;
    position: relative;
    overflow: hidden;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 100px,
            rgba(255,255,255,0.03) 100px,
            rgba(255,255,255,0.03) 102px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 100px,
            rgba(255,255,255,0.03) 100px,
            rgba(255,255,255,0.03) 102px
        );
}

.hero .container {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== СЕКЦИИ ===== */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    font-size: 2rem;
    color: var(--rzd-gray-dark);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--rzd-red);
    margin: var(--spacing-sm) auto 0;
}

/* ===== СТАТИСТИКА ===== */
.stats {
    background: var(--rzd-gray-light);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    background: var(--rzd-white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border-top: 4px solid var(--rzd-red);
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--rzd-red);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--rzd-gray);
    font-size: 0.95rem;
}

/* ===== КАТЕГОРИИ ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background: var(--rzd-white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    border: 1px solid #eee;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--rzd-red);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--rzd-red) 0%, var(--rzd-red-dark) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.category-icon svg {
    width: 32px;
    height: 32px;
    color: var(--rzd-white);
}

.category-title {
    font-size: 1.25rem;
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-xs);
}

.category-desc {
    color: var(--rzd-gray);
    font-size: 0.95rem;
}

/* ===== CTA СЕКЦИЯ ===== */
.cta {
    background: linear-gradient(135deg, var(--rzd-gray-dark) 0%, var(--rzd-black) 100%);
    color: var(--rzd-white);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.cta-text {
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

/* ===== ПОДВАЛ ===== */
.footer {
    background: var(--rzd-gray-dark);
    color: var(--rzd-white);
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-text {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* ===== СТРАНИЦА ПРАВИЛ ===== */
.page-header {
    background: linear-gradient(135deg, var(--rzd-red) 0%, var(--rzd-red-dark) 100%);
    color: var(--rzd-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    opacity: 0.9;
    font-size: 1.1rem;
}

/* Навигация по правилам */
.rules-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--rzd-gray-light);
    border-radius: 8px;
}

.rules-nav-link {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--rzd-white);
    color: var(--rzd-gray-dark);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: var(--transition-fast);
    border: 2px solid transparent;
}

.rules-nav-link:hover {
    border-color: var(--rzd-red);
    color: var(--rzd-red);
}

/* Блоки правил */
.rule-block {
    background: var(--rzd-white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    border: 1px solid #eee;
}

.rule-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--rzd-gray-light);
    border-bottom: 1px solid #eee;
    font-size: 1.3rem;
}

.rule-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--rzd-red);
    color: var(--rzd-white);
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: bold;
}

.rule-content {
    padding: var(--spacing-lg);
}

.rule-list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.rule-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    border-bottom: 1px solid #f0f0f0;
}

.rule-list li:last-child {
    border-bottom: none;
}

.rule-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--rzd-red);
    border-radius: 50%;
}

.rule-warning {
    background: linear-gradient(135deg, #fff5f5 0%, #ffe8e8 100%);
    border-left: 4px solid var(--rzd-red);
    padding: var(--spacing-md);
    border-radius: 0 8px 8px 0;
    color: var(--rzd-red-dark);
}

/* Расстояния */
.rule-distances {
    margin-top: var(--spacing-lg);
}

.rule-distances h4 {
    margin-bottom: var(--spacing-md);
    color: var(--rzd-gray-dark);
}

.distance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.distance-item {
    background: var(--rzd-gray-light);
    padding: var(--spacing-md);
    border-radius: 8px;
    text-align: center;
}

.distance-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--rzd-red);
    margin-bottom: var(--spacing-xs);
}

.distance-label {
    font-size: 0.9rem;
    color: var(--rzd-gray);
}

/* Опасные зоны */
.danger-zones {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.danger-zone {
    padding: var(--spacing-md);
    border-radius: 8px;
    background: var(--rzd-gray-light);
}

.zone-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.zone-icon.danger {
    background: var(--rzd-red);
    color: var(--rzd-white);
}

.zone-icon.warning {
    background: var(--warning-yellow);
    color: var(--rzd-gray-dark);
}

.danger-zone h4 {
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-xs);
}

.danger-zone p {
    font-size: 0.9rem;
    color: var(--rzd-gray);
}

/* Спецодежда */
.clothes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.clothes-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--rzd-gray-light);
    border-radius: 8px;
}

.clothes-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.clothes-item h4 {
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-xs);
}

.clothes-item p {
    font-size: 0.9rem;
    color: var(--rzd-gray);
}

/* Сигналы */
.signals-table {
    border: 1px solid #eee;
    border-radius: 8px;
    overflow: hidden;
}

.signal-row {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid #eee;
}

.signal-row:last-child {
    border-bottom: none;
}

.signal-row.highlight {
    background: #fff5f5;
}

.signal-code {
    min-width: 100px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--rzd-red);
    letter-spacing: 4px;
}

.signal-desc {
    color: var(--rzd-gray-dark);
}

/* Действия при ЧС */
.emergency-steps {
    margin-bottom: var(--spacing-lg);
}

.emergency-step {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid #eee;
}

.emergency-step:last-child {
    border-bottom: none;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--rzd-red);
    color: var(--rzd-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h4 {
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    color: var(--rzd-gray);
    font-size: 0.95rem;
}

.emergency-contacts {
    background: var(--rzd-gray-light);
    padding: var(--spacing-md);
    border-radius: 8px;
}

.emergency-contacts h4 {
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-sm);
}

.contacts-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.contact {
    background: var(--rzd-white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 4px;
    font-weight: 500;
    color: var(--rzd-gray-dark);
}

/* ===== СТРАНИЦА ТЕСТА ===== */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--rzd-gray-light);
    border-radius: 8px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #ddd;
    border-radius: 4px;
    margin: 0 var(--spacing-md);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--rzd-red);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.quiz-card {
    background: var(--rzd-white);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.question-number {
    color: var(--rzd-red);
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
}

.question-text {
    font-size: 1.3rem;
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

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

.answer-option {
    display: block;
    padding: var(--spacing-md);
    background: var(--rzd-gray-light);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.answer-option:hover {
    border-color: var(--rzd-red);
    background: #fff5f5;
}

.answer-option input {
    display: none;
}

.answer-option input:checked + .answer-text {
    color: var(--rzd-red);
    font-weight: bold;
}

.answer-option:has(input:checked) {
    border-color: var(--rzd-red);
    background: #fff5f5;
}

.answer-text {
    color: var(--rzd-gray-dark);
}

.quiz-submit {
    text-align: center;
}

/* Результаты */
.result-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.result-score {
    font-size: 4rem;
    font-weight: bold;
    margin-bottom: var(--spacing-sm);
}

.result-score.excellent {
    color: var(--success-green);
}

.result-score.good {
    color: var(--warning-yellow);
}

.result-score.poor {
    color: var(--rzd-red);
}

.result-message {
    font-size: 1.5rem;
    color: var(--rzd-gray-dark);
    margin-bottom: var(--spacing-md);
}

.result-details {
    color: var(--rzd-gray);
    margin-bottom: var(--spacing-lg);
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-outline {
    background: transparent;
    color: var(--rzd-red);
    border: 2px solid var(--rzd-red);
}

.btn-outline:hover {
    background: var(--rzd-red);
    color: var(--rzd-white);
}

/* ===== АДАПТИВНОСТЬ ===== */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-link.active::after {
        display: none;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .rule-title {
        flex-direction: column;
        text-align: center;
        font-size: 1.1rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .signal-row {
        flex-direction: column;
        text-align: center;
    }
    
    .signal-code {
        margin-bottom: var(--spacing-xs);
    }
}