:root {
    /* Цветовая палитра (Light - Clean Tech) */
    --bg-color: #f0f2f5;
    --sidebar-bg: rgba(255, 255, 255, 0.85);
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-color: #2563eb; /* Royal Blue */
    --accent-glow: rgba(37, 99, 235, 0.3);
    --border-color: rgba(0, 0, 0, 0.08);
    --success-color: #10b981;
    --warning-bg: #fff7ed;
    --warning-border: #ffedd5;
    --warning-text: #9a3412;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

body.dark-theme {
    /* Цветовая палитра (Dark - Neon Cyber) */
    --bg-color: #0b0f19; /* Deep Space */
    --sidebar-bg: rgba(17, 24, 39, 0.7);
    --card-bg: #111827;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-color: #00e0ff; /* Cyan Neon */
    --accent-glow: rgba(0, 224, 255, 0.15);
    --border-color: rgba(255, 255, 255, 0.08);
    --success-color: #34d399;
    --warning-bg: rgba(251, 191, 36, 0.1);
    --warning-border: rgba(251, 191, 36, 0.2);
    --warning-text: #fbbf24;
    --code-bg: #000000;
    --code-text: #00e0ff;
    --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: all 0.4s ease;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 224, 255, 0.05) 0%, transparent 40%);
    min-height: 100vh;
}

/* === Layout & Containers === */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 20px;
}

.content-wrapper {
    display: flex;
    gap: 30px;
    margin-top: 30px;
    align-items: flex-start;
}

/* === Header === */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(var(--bg-color), 0.8); 
}

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

.logo img {
    height: 50px;
    filter: drop-shadow(0 0 8px var(--accent-glow));
    transition: transform 0.3s;
}

.logo img:hover {
    transform: scale(1.05);
}

/* === Sidebar (Glassmorphism) === */
.sidebar {
    width: 260px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    position: sticky;
    top: 100px;
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s ease;
}

.sidebar ul {
    list-style: none;
}

.sidebar li {
    padding: 14px 18px;
    margin-bottom: 8px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar li:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent-color);
    transform: translateX(5px);
}

.sidebar li.active {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1) 0%, transparent 100%);
    color: var(--accent-color);
    border-left: 3px solid var(--accent-color);
}

body.dark-theme .sidebar li.active {
    background: linear-gradient(90deg, rgba(0, 224, 255, 0.1) 0%, transparent 100%);
}

.sidebar li i {
    width: 20px;
    text-align: center;
}

/* === Main Content === */
.main-content {
    flex: 1;
    background: var(--card-bg);
    background: linear-gradient(145deg, var(--card-bg) 0%, rgba(255,255,255,0.02) 100%);
    border-radius: 20px;
    padding: 40px;
    border: 1px solid var(--border-color);
    box-shadow: var(--glass-shadow);
    min-height: 80vh;
    
    /* FIX: Возвращаем flex для горизонтального расположения main и aside */
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

main {
    flex: 1;
    min-width: 0; /* Важно для переноса текста внутри flex-контейнера */
}

h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 30px;
    background: linear-gradient(to right, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 24px;
    margin: 40px 0 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

h2::before {
    content: '';
    display: block;
    width: 6px;
    height: 24px;
    background: var(--accent-color);
    border-radius: 4px;
    box-shadow: 0 0 10px var(--accent-color);
}

p, li {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 16px;
}

ul {
    margin-left: 20px;
}

/* === Interactive Elements === */
code {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 4px 8px;
    border-radius: 6px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
    border: 1px solid var(--border-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    position: relative;
}

a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -2px;
    left: 0;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.25s ease-out;
}

a:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* === Pricing Tables === */
.pricing-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 30px 0;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.pricing-table th, .pricing-table td {
    padding: 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
    background: rgba(0,0,0,0.03);
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
    font-weight: 600;
}

body.dark-theme .pricing-table th {
    background: rgba(255,255,255,0.03);
}

/* === Accordion === */
.accordion {
    margin: 20px 0;
}

.accordion-item {
    background: transparent;
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.3s;
}

.accordion-item:hover {
    border-color: var(--accent-color);
}

.accordion-header {
    background: transparent;
    padding: 18px 24px;
    font-weight: 600;
    color: var(--text-primary);
    border: none;
    width: 100%;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.accordion-header i {
    transition: transform 0.3s;
}

.accordion-header.active {
    color: var(--accent-color);
    background: rgba(var(--accent-color), 0.05);
}

.accordion-header.active i {
    transform: rotate(180deg);
}

.accordion-content {
    background: rgba(0,0,0,0.02);
    border-top: 1px solid var(--border-color);
    padding: 24px;
    display: none;
}
.accordion-content.active {
    display: block;
}

/* === Notifications (Info/Warning) === */
.info, .warning {
    display: flex;
    padding: 16px;
    border-radius: 12px;
    margin: 20px 0;
    border: 1px solid transparent;
}

.info {
    background: rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.2);
    color: var(--text-primary);
}

.warning {
    background: var(--warning-bg);
    border-color: var(--warning-border);
    color: var(--warning-text);
}

.info i, .warning i {
    font-size: 20px;
    margin-right: 15px;
    margin-top: 2px;
}

.info p, .warning p {
    margin: 0;
    color: inherit;
}

/* === UI Controls === */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-primary);
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #cbd5e1;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

/* === TOC Sidebar === */
.toc-sidebar {
    width: 220px;
    position: sticky;
    top: 100px;
    padding-left: 20px;
    border-left: 1px solid var(--border-color);
}

.toc-sidebar h2 {
    font-size: 14px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 0;
    letter-spacing: 1px;
}

.toc-sidebar h2::before { display: none; }

.toc-sidebar ul.toc {
    list-style: none;
    margin-left: 0;
}

.toc-sidebar ul.toc li {
    margin-bottom: 8px;
}

.toc-sidebar ul.toc li a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
    display: block;
    padding: 2px 0;
    transition: color 0.2s;
}

.toc-sidebar ul.toc li a:hover {
    color: var(--accent-color);
}

.toc-sidebar ul.toc li a::after { display: none; }

/* === Footer === */
footer {
    margin-top: 60px;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-links {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}

.footer-copyright {
    display: flex;
    justify-content: center;
}

.copyright-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* === Mobile Adaptations === */
@media (max-width: 1024px) {
    /* На планшетах переносим TOC вниз */
    .main-content {
        flex-direction: column;
    }
    
    .toc-sidebar {
        width: 100%;
        border-left: none;
        padding-left: 0;
        margin-top: 40px;
        padding-top: 20px;
        border-top: 1px solid var(--border-color);
        position: static;
    }
    
    .content-wrapper { flex-wrap: wrap; }
    .main-content { width: 100%; }
}

@media (max-width: 768px) {
    /* На телефонах скрываем TOC */
    .toc-sidebar { display: none; }
    
    .content-wrapper { flex-direction: column; }
    
    header {
        position: fixed;
        width: 100%;
        background: rgba(var(--bg-color), 0.95);
        padding: 15px 20px;
    }
    
    .container { padding-top: 80px; }
    
    .sidebar {
        position: fixed;
        height: 100vh;
        z-index: 1000;
        left: 0; top: 0;
        width: 280px;
        transform: translateX(-100%);
        border-radius: 0;
        background: var(--card-bg);
    }
    
    .sidebar.open { transform: translateX(0); }
    
    .menu-toggle { display: block; }
    .theme-toggle.desktop-only { display: none !important; }
    
    .sidebar .theme-toggle.mobile-only {
        display: flex !important;
        margin-top: 20px;
        padding-top: 20px;
        border-top: 1px solid var(--border-color);
        justify-content: space-between;
    }

    .main-content { 
        padding: 20px; 
        border-radius: 0; 
        border: none; 
        background: transparent; 
        box-shadow: none; 
    }
    
    h1 { font-size: 28px; }
}

@media (min-width: 769px) {
    .theme-toggle.mobile-only { display: none !important; }
}