/* Глобальные CSS-переменные: цветовая палитра, размытие, шрифты и премиум-эффекты перехода */
:root {
    --bg-primary: #08090c;
    --bg-secondary: #10121a;
    --bg-glass: rgba(16, 18, 26, 0.65);
    --bg-glass-hover: rgba(24, 27, 38, 0.8);
    --border-glass: rgba(255, 255, 255, 0.07);
    --border-glass-hover: rgba(0, 242, 254, 0.3);
    
    --accent-cyan: #00f2fe;
    --accent-purple: #7f00ff;
    --accent-green: #00ff87;
    --accent-orange: #ff9900;
    
    --text-main: #f5f7fa;
    --text-muted: #8e9bb4;
    
    --font-outfit: 'Outfit', sans-serif;
    --font-montserrat: 'Montserrat', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --shadow-glow: 0 8px 32px 0 rgba(0, 242, 254, 0.15);
    --shadow-glow-purple: 0 8px 32px 0 rgba(127, 0, 8, 0.15);
    
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Логика мультиязычности: скрывает элементы с невыбранным атрибутом lang */
html.lang-ua [lang="en"] {
    display: none !important;
}
html.lang-en [lang="ua"] {
    display: none !important;
}

/* Базовые сбросы стилей, сглаживание шрифтов и отключение горизонтальной прокрутки */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

/* Декоративные фоновые паттерны: цифровая сетка и неоновое градиентное свечение */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.01) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.01) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -2;
    pointer-events: none;
}

.bg-glow {
    position: fixed;
    top: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(0, 242, 254, 0.04) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
    filter: blur(80px);
}

/* Вспомогательные классы разметки: центрирование, секции, отступы и CSS Grid-сетки */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 8rem 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
}

.section-title {
    font-family: var(--font-montserrat);
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    font-weight: 400;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.flex-center-y {
    display: flex;
    align-items: center;
}

/* Элементы с премиальным эффектом матового стекла (Glassmorphic Backdrop Filter) */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid var(--border-glass);
    border-radius: 1.5rem;
    padding: 3rem;
    transition: var(--transition-smooth);
}

.glass-card:hover {
    border-color: var(--border-glass-hover);
    box-shadow: var(--shadow-glow);
    background: var(--bg-glass-hover);
}

/* Стили кнопок: основные градиентные и второстепенные контурные с плавным ховером */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.2rem;
    font-family: var(--font-montserrat);
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 3rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #fff;
    border: none;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px 0 rgba(0, 242, 254, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(5px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-main);
    transform: translateY(-3px);
}

.btn-sm {
    padding: 0.6rem 1.2rem;
    font-size: 0.8rem;
}

/* Контейнеры для иконок с внутренним свечением и градиентными границами */
.icon-box {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(127, 0, 255, 0.1));
    border: 1px solid rgba(0, 242, 254, 0.2);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
}

.card-title {
    font-family: var(--font-montserrat);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
}

.card-text {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Маленькие бирюзовые бейджи для акцентирования внимания на типе контента */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 242, 254, 0.07);
    border: 1px solid rgba(0, 242, 254, 0.15);
    color: var(--accent-cyan);
    padding: 0.5rem 1.2rem;
    border-radius: 2rem;
    font-family: var(--font-montserrat);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
}

/* Градиентное окрашивание текста с эффектом неонового свечения */
.text-glow {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* Фиксированная шапка сайта (хедер), логотип «ШЕФ» и адаптивная навигация */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    transition: var(--transition-smooth);
    padding: 1.5rem 0;
}

.header.scrolled {
    background: rgba(8, 9, 12, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    padding: 1rem 0;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-badge {
    background-color: #000;
    color: #fff;
    font-family: var(--font-montserrat);
    font-weight: 900;
    font-size: 0.95rem;
    padding: 0.35rem 0.65rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    margin-right: 0.75rem;
    letter-spacing: -0.02em;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    border: none;
}

.logo-text-wrapper {
    font-family: var(--font-montserrat);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.logo-accent {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.2rem;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-montserrat);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--accent-cyan);
}

.nav-link.active {
    color: var(--text-main);
    border-bottom: 2px solid var(--accent-cyan);
}

.btn-letter {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    padding: 0.6rem 1.5rem;
    border-radius: 2rem;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lang-switch {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-montserrat);
    font-weight: 700;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 0.4rem 0.8rem;
    border-radius: 1rem;
    border: 1px solid transparent;
}

.lang-switch:hover {
    border-color: var(--border-glass);
    background: rgba(255, 255, 255, 0.02);
}

.lang-text.active {
    color: var(--accent-cyan);
}

.lang-separator {
    color: var(--border-glass);
}

.mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Раздел приветственного экрана (Hero) с текстовым описанием и CTA-кнопками */
.hero-section {
    padding-top: 10rem;
    padding-bottom: 6rem;
    min-height: 95vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-family: var(--font-montserrat);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 90%;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    border-top: 1px solid var(--border-glass);
    padding-top: 2rem;
}

.stat-card {
    text-align: left;
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-main);
    font-family: var(--font-montserrat);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Оформление картинки концепта «Кентавр» со скруглением и теневым свечением */
.hero-visual {
    position: relative;
    width: 100%;
}

.image-wrapper {
    position: relative;
    border-radius: 2rem;
    overflow: hidden;
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-glow-purple);
    aspect-ratio: 16/9;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, rgba(8, 9, 12, 0.85));
    pointer-events: none;
}

/* Анимированная горизонтальная линия, симулирующая лазерное 3D-сканирование дороги */
.laser-scanner {
    position: absolute;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
    top: 0;
    left: 0;
    opacity: 0.65;
    box-shadow: 0 0 12px var(--accent-cyan);
    animation: scanning 4.5s ease-in-out infinite;
    pointer-events: none;
}

@keyframes scanning {
    0% { top: 0%; }
    50% { top: 100%; }
    100% { top: 0%; }
}

/* Разметка интерактивной симуляции Canvas и темного поля лога телеметрии */
.swarm-interactive {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
    margin-top: 3rem;
}

.swarm-visualizer {
    background: #0d0f15;
    border: 1px solid var(--border-glass);
    border-radius: 1.5rem;
    height: 480px;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 0 40px rgba(0,0,0,0.6);
}

#swarmCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

.swarm-overlay-card {
    position: absolute;
    bottom: 1.5rem;
    left: 1.5rem;
    width: calc(100% - 3rem);
    background: rgba(16, 18, 26, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 0.9rem;
    backdrop-filter: blur(8px);
}

.telemetry-log {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-muted);
    max-height: 110px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.swarm-actions-group {
    display: flex;
    gap: 0.8rem;
    margin-top: 1.5rem;
}

.btn-paused {
    border-color: var(--accent-green) !important;
    color: var(--accent-green) !important;
    box-shadow: 0 0 10px rgba(0, 255, 135, 0.15);
}

.log-line {
    animation: fadeIn 0.3s forwards;
}

.swarm-steps {
    list-style: none;
    margin-bottom: 2.5rem;
}

.swarm-steps li {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.8rem;
}

.step-num {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.1);
}

.step-content h4 {
    font-family: var(--font-montserrat);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

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

/* Карточки автопарка лаборатории с плавной анимацией приподнимания при наведении */
.car-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 1.5rem;
    padding: 2.5rem;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.car-card:hover {
    border-color: var(--border-glass-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-5px);
}

.car-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.car-icon {
    font-size: 1.8rem;
    color: var(--accent-cyan);
}

.car-era {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    padding: 0.3rem 0.8rem;
    border-radius: 1rem;
}

.car-name {
    font-family: var(--font-montserrat);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.car-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.car-badge {
    display: inline-flex;
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 2rem;
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.comment-box {
    margin-top: 4rem;
    background: rgba(255, 153, 0, 0.03);
    border: 1px dashed rgba(255, 153, 0, 0.25);
    border-radius: 1rem;
    padding: 1.8rem 2.2rem;
}

.comment-text {
    font-size: 1rem;
    color: var(--text-muted);
}

.comment-text i {
    color: var(--accent-orange);
    margin-right: 0.5rem;
}

/* Панель вкладок апаратного комплекса и логика плавного появления контента вкладок */
.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    padding: 0.5rem;
    border-radius: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-montserrat);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.8rem 1.5rem;
    border-radius: 2.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-transform: uppercase;
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
}

.tab-content-container {
    position: relative;
    min-height: 400px;
}

.tab-pane {
    display: none;
    animation: tabFadeIn 0.5s ease-in-out forwards;
}

.tab-pane.active {
    display: block;
}

@keyframes tabFadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stage-details {
    padding-right: 2rem;
}

.stage-title {
    font-family: var(--font-montserrat);
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.stage-intro {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.price-box {
    background: rgba(0, 242, 254, 0.03);
    border: 1px solid rgba(0, 242, 254, 0.1);
    border-radius: 1.2rem;
    padding: 1.8rem 2.2rem;
    margin-bottom: 2rem;
}

.price-label {
    display: block;
    font-family: var(--font-montserrat);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.price-value {
    font-family: var(--font-montserrat);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.usd-value {
    font-size: 1.3rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

.price-notes {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.specs-title {
    font-family: var(--font-montserrat);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.specs-list {
    list-style: none;
}

.specs-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.4rem;
    font-size: 1.02rem;
}

.spec-bullet {
    margin-top: 0.35rem;
    color: var(--accent-cyan);
    font-size: 0.7rem;
}

/* Оформление таблицы цен модулей этапа 2.0 со строками, подсвечивающимися при наведении */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: 1rem;
    border: 1px solid var(--border-glass);
}

.prices-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.prices-table th, .prices-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-glass);
}

.prices-table th {
    background: rgba(255, 255, 255, 0.02);
    font-family: var(--font-montserrat);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

.prices-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.015);
}

/* Кастомизация калькулятора, ползунков выбора диапазона и результатов окупаемости */
.calculator-card {
    border-color: rgba(127, 0, 255, 0.15);
}

.calculator-card:hover {
    border-color: rgba(127, 0, 255, 0.35);
    box-shadow: var(--shadow-glow-purple);
}

.calc-inputs {
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
    margin-top: 2rem;
    margin-bottom: 3rem;
}

.input-group label {
    display: block;
    font-family: var(--font-montserrat);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.slider-wrapper input[type="range"] {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 5px;
    outline: none;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent-purple);
    border: 2px solid var(--accent-cyan);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-cyan);
    transition: 0.15s;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-value {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-main);
    width: 45px;
    text-align: right;
}

.calc-results {
    background: rgba(127, 0, 255, 0.03);
    border: 1px solid rgba(127, 0, 255, 0.1);
    border-radius: 1.2rem;
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.result-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-box.highlighted {
    border-top: 1px solid rgba(127, 0, 255, 0.15);
    padding-top: 1.2rem;
}

.result-label {
    font-size: 1.02rem;
    color: var(--text-muted);
}

.result-value {
    font-family: var(--font-montserrat);
    font-size: 1.5rem;
    font-weight: 700;
}

.result-box.highlighted .result-value {
    font-size: 2.2rem;
    font-weight: 800;
}

/* Разметка бланка официального открытого письма к Alphabet с датой и подписями */
.exclusivity-alert {
    background: rgba(0, 242, 254, 0.03);
    border: 1px solid rgba(0, 242, 254, 0.15);
    border-radius: 1.2rem;
    padding: 2.2rem;
    margin-bottom: 3.5rem;
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.exclusivity-alert i {
    font-size: 2.2rem;
    color: var(--accent-cyan);
    margin-top: 0.2rem;
}

.exclusivity-alert h4 {
    font-family: var(--font-montserrat);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.exclusivity-alert p {
    font-size: 1rem;
    color: var(--text-muted);
}

.letter-box {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 2rem;
    padding: 5rem 6rem;
    box-shadow: 0 20px 80px rgba(0,0,0,0.5);
}

.letter-actions-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 2rem;
    margin-bottom: 4rem;
}

.letter-meta {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.meta-separator {
    color: var(--border-glass);
    margin: 0 1rem;
}

.letter-text {
    font-size: 1.15rem;
    line-height: 1.85;
    color: #e2e8f0;
}

.letter-text p {
    margin-bottom: 2rem;
}

.letter-text .lead {
    font-size: 1.4rem;
    line-height: 1.7;
    color: #fff;
    margin-bottom: 3rem;
    font-weight: 300;
}

.letter-text h3 {
    font-family: var(--font-montserrat);
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 3.5rem;
    margin-bottom: 1.5rem;
    color: #fff;
    border-left: 3px solid var(--accent-cyan);
    padding-left: 1.2rem;
}

.letter-text hr {
    border: none;
    border-top: 1px solid var(--border-glass);
    margin: 4rem 0;
}

.letter-signature {
    margin-top: 3rem;
}

.sig-name {
    font-family: var(--font-montserrat);
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-top: 0.5rem;
}

.sig-meta {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Оформление подвала (футера), почты, YouTube-ссылок и копирайта */
.footer {
    background: #06070a;
    border-top: 1px solid var(--border-glass);
    padding: 6rem 0 3rem 0;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 5rem;
}

.footer-brand {
    font-family: var(--font-montserrat);
    font-size: 1.4rem;
    font-weight: 800;
}

.footer-tagline {
    font-family: var(--font-outfit);
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 0.8rem;
}

.footer-links h4 {
    font-family: var(--font-montserrat);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.social-link {
    color: var(--text-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.social-link:hover {
    color: var(--accent-cyan);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 2rem 0 2rem;
    border-top: 1px solid rgba(255,255,255,0.02);
    text-align: center;
    color: rgba(255,255,255,0.25);
    font-size: 0.85rem;
}

/* Анимация сканирования лазером и плавного появления элементов */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Микро-взаимодействия: неоновые тени для активных элементов навигации */
.nav-link.active, .btn-letter:hover {
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.2);
}

/* Медиа-запросы адаптации для планшетов и средних экранов (до 1024px и до 768px) */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3.5rem;
        text-align: center;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .stats-grid {
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .grid-3 {
        grid-template-columns: 1fr 1fr;
    }
    
    .letter-box {
        padding: 4rem 3rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 5rem 0;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .hero-title {
        font-size: 2.6rem;
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .swarm-interactive {
        grid-template-columns: 1fr;
    }
    
    .header-container {
        position: relative;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(8, 9, 12, 0.98);
        border-bottom: 1px solid var(--border-glass);
        padding: 2.5rem 2rem;
        flex-direction: column;
        align-items: stretch;
        gap: 1.8rem;
        transform: translateY(-20px);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition-smooth);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
    }
    
    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 3rem;
    }
}

@media (max-width: 576px) {
    /* Global container padding reduction to avoid clipping */
    .container, .header-container, .hero-container {
        padding: 0 1.2rem;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    /* Header logo and actions scaling */
    .logo-badge {
        font-size: 0.8rem;
        padding: 0.25rem 0.5rem;
        margin-right: 0.4rem;
    }
    
    .logo-text-wrapper {
        font-size: 1.05rem;
        white-space: nowrap;
    }
    
    .logo-accent {
        display: none;
    }
    
    .header-actions {
        gap: 0.8rem;
    }
    
    .lang-switch {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }
    
    /* Hero section scaling */
    .hero-section {
        padding-top: 8rem;
        padding-bottom: 4rem;
    }
    
    .hero-title {
        font-size: 1.85rem;
        line-height: 1.3;
        word-wrap: break-word;
        word-break: break-word;
        hyphens: auto;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
        max-width: 100%;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
        margin-bottom: 2.5rem;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    /* Stats grid stacking */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding-top: 1.5rem;
        text-align: center;
    }
    
    .stat-card {
        text-align: center;
    }
    
    .stat-value {
        font-size: 1.8rem;
    }
    
    /* Swarm Visualizer responsive tweaks */
    .swarm-visualizer {
        height: 360px;
    }
    
    .swarm-overlay-card {
        bottom: 0.8rem;
        left: 0.8rem;
        width: calc(100% - 1.6rem);
        padding: 0.8rem;
    }
    
    .telemetry-log {
        font-size: 0.75rem;
        max-height: 60px;
    }
    
    /* Exclusivity alert stacking */
    .exclusivity-alert {
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem;
    }
    
    .exclusivity-alert i {
        font-size: 1.8rem;
        margin-top: 0;
    }
    
    /* Open letter layout styling */
    .letter-box {
        padding: 2.5rem 1.2rem;
        border-radius: 1.2rem;
    }
    
    .letter-actions-top {
        flex-direction: column;
        gap: 1.5rem;
        align-items: stretch;
        margin-bottom: 2.5rem;
    }
    
    .letter-meta {
        text-align: center;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .meta-separator {
        display: none;
    }
    
    .letter-actions-top .btn {
        width: 100%;
    }
    
    .letter-text {
        font-size: 1rem;
        line-height: 1.75;
    }
    
    .letter-text .lead {
        font-size: 1.15rem;
        margin-bottom: 2rem;
    }
    
    .letter-text h3 {
        font-size: 1.25rem;
        margin-top: 2.5rem;
        padding-left: 0.8rem;
    }
    
    /* Tabs Navigation styling */
    .tabs-nav {
        flex-direction: column;
        border-radius: 1.5rem;
        padding: 0.4rem;
        gap: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
    }
    
    /* Car cards padding */
    .car-card {
        padding: 1.5rem;
    }
    
    /* Prices table responsive spacing */
    .prices-table th, .prices-table td {
        padding: 0.75rem 0.75rem;
        font-size: 0.82rem;
    }
    
    /* Payback calculator styling */
    .calc-inputs {
        gap: 1.5rem;
        margin-bottom: 2rem;
    }
    
    .slider-wrapper {
        gap: 1rem;
    }
    
    .slider-value {
        font-size: 1rem;
        width: 35px;
    }
    
    .calc-results {
        padding: 1.2rem;
    }
    
    .result-value {
        font-size: 1.25rem;
    }
    
    .result-box.highlighted .result-value {
        font-size: 1.8rem;
    }
    
    .swarm-actions-group {
        flex-direction: column;
        gap: 0.6rem;
    }
}

/* Стили печати: скрывают все фоны, шапки и футеры, оставляя только чистый текст письма на белом фоне */
@media print {
    body {
        background: #fff !important;
        color: #000 !important;
    }
    .header, .footer, .bg-grid, .bg-glow, .hero-section, .concept-section, .swarm-section, .garage-section, .hardware-section, .economy-section, .letter-actions-top, .exclusivity-alert {
        display: none !important;
    }
    .letter-section {
        padding: 0 !important;
    }
    .letter-box {
        border: none !important;
        box-shadow: none !important;
        background: none !important;
        padding: 0 !important;
        color: #000 !important;
    }
    .letter-text {
        color: #000 !important;
        font-size: 11pt !important;
    }
    .letter-text h3 {
        color: #000 !important;
        border-left: 2px solid #000 !important;
    }
    .letter-text .lead {
        color: #000 !important;
    }
    .sig-name {
        color: #000 !important;
    }
}