:root {
    /* Colors */
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --accent-color: #ff9800;
    --bg-color: #ffffff;
    --bg-alt: #f8f9fa;
    --text-color: #333333;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    
    /* Layout */
    --container-width: 1200px;
    --section-padding: 60px 0;
    --border-radius: 8px;
    
    /* Typography */
    --font-main: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #333;
}

.logo-accent {
    color: var(--primary-color);
}

.nav-links {
    display: none; /* Mobile first */
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f0f7ff 0%, #e0efff 100%);
    padding: 100px 0;
    text-align: center;
    animation: fadeInDown 1s ease-out;
}

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

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-cta {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-example {
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 15px;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-example:hover {
    background-color: var(--border-color);
}

.btn-example i {
    color: var(--primary-color);
}

/* Sections */
.section {
    padding: var(--section-padding);
}

.bg-alt {
    background-color: var(--bg-alt);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.section-title i {
    color: var(--primary-color);
}

/* Grid System */
.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.mission-step {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 60px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.mission-step.fade-in {
    opacity: 1;
    transform: translateY(0);
}

.card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.card.fade-in {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.card h3 {
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.card p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin-top: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--bg-alt);
    font-weight: 600;
}

/* Code Highlighting */
pre {
    border-radius: 8px !important;
    margin: 20px 0 !important;
    position: relative;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 10;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.copy-btn i {
    font-size: 0.9rem;
}

code {
    font-family: var(--font-mono);
}

/* Mission Guide */
.mission-step {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 60px;
}

.step-content h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
}

.video-placeholder, .scheme-placeholder {
    background-color: #eee;
    height: 250px;
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    color: var(--text-muted);
    border: 2px dashed #ccc;
}

.video-placeholder i, .scheme-placeholder i {
    font-size: 3rem;
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: #fff;
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: #fff;
    margin-bottom: 20px;
}

.footer-links h4, .footer-contact h4 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    color: #888;
    font-size: 0.9rem;
}

/* API Panel (устаревшая на главной — удалено) */
/* API Panel (возвращена как панель подсказок с вкладками) */
/* (удалено: панель API на главной — используется только в навигаторе) */

/* Desktop Styles */
@media (min-width: 768px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 30px;
    }

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

    .nav-link-btn {
        background-color: var(--primary-color);
        color: #fff;
        padding: 8px 20px;
        border-radius: 20px;
    }

    .mobile-nav-toggle {
        display: none;
    }

    .hero h1 {
        font-size: 3.5rem;
    }

    .mission-step {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}