:root {
    /* Colors - Dark Theme (Default) */
    --bg-body: #0f172a;
    --bg-surface: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-gradient: radial-gradient(circle at top right, #1e293b, #0f172a);
    --border-color: #334155;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #8b5cf6;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #0ea5e9;
    --code-bg: rgba(0, 0, 0, 0.3);
    
    /* Layout */
    --sidebar-width: 260px;
    --header-height: 60px;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --glass: blur(12px);
}

[data-theme="light"] {
    --bg-body: #f1f5f9;
    --bg-surface: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-gradient: radial-gradient(circle at top right, #f8fafc, #e2e8f0);
    --border-color: #cbd5e1;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --accent: #7c3aed;
    --text-main: #0f172a;
    --text-muted: #475569;
    --code-bg: rgba(0, 0, 0, 0.05);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 20px; /* Отступ при прокрутке к якорю */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    transition: background 0.3s, background-color 0.3s, color 0.3s;
}

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

a:hover {
    color: var(--primary-hover);
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 50;
    transition: transform 0.3s ease, background-color 0.3s, border-color 0.3s;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-main);
}

.sidebar-header .logo img {
    height: 32px;
}

.nav-menu {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-menu ul {
    list-style: none;
}

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-muted);
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-menu a:hover, .nav-menu a.active {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary);
}

.nav-menu a.active {
    border-left-color: var(--primary);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

/* Theme Toggle */
.theme-toggle-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
    color: var(--text-muted);
}

.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

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

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

.copyright {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 30px;
    max-width: 100%;
}

.content-container {
    max-width: 900px;
    margin: 0 auto;
}

/* Typography & Elements */
h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1rem;
    color: var(--text-main);
    padding-top: 10px; /* Немного места для якоря */
}

h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 0.5rem;
    color: var(--text-main);
    font-weight: 600;
}

h4 {
    font-size: 1.1rem;
    margin: 1.2rem 0 0.5rem;
    color: var(--text-main);
    font-weight: 600;
}

p {
    margin-bottom: 1.2rem;
    color: var(--text-muted);
    font-size: 1.05rem;
}

ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-muted);
}

li {
    margin-bottom: 0.5rem;
}

strong {
    color: var(--text-main);
}

/* Cards & Glassmorphism */
.card, .info, .warning {
    background: var(--bg-card);
    backdrop-filter: var(--glass);
    -webkit-backdrop-filter: var(--glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s, border-color 0.3s;
}

/* Sub-sections inside cards */
.sub-section {
    margin-bottom: 25px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}
.sub-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

/* Alerts */
.info, .warning {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 15px 20px;
}

.info {
    border-left: 4px solid var(--info);
    background: rgba(14, 165, 233, 0.1);
}

.warning {
    border-left: 4px solid var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.info i, .warning i {
    font-size: 1.2rem;
    margin-top: 3px;
}

.info i { color: var(--info); }
.warning i { color: var(--warning); }

.info p, .warning p {
    margin: 0;
    color: var(--text-main);
    font-size: 0.95rem;
}

/* Table */
.pricing-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 2rem 0;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.pricing-table th, .pricing-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

.pricing-table th {
    background-color: var(--bg-surface);
    font-weight: 600;
}

.pricing-table td {
    background-color: var(--bg-card);
}

.pricing-table tr:last-child td {
    border-bottom: none;
}

/* TOC (Table of Contents) Sidebar */
.toc-sidebar {
    width: 240px;
    position: fixed;
    right: 20px;
    top: 80px;
    padding: 20px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    display: none;
    background: var(--bg-surface); /* Добавил фон для лучшей читаемости */
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.toc-sidebar h2 {
    font-size: 0.9rem;
    margin: 0 0 15px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    padding-top: 0;
}

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

.toc-sidebar li {
    margin-bottom: 0;
}

.toc-sidebar a {
    display: block;
    padding: 8px 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
}

.toc-sidebar a:hover {
    color: var(--primary);
    background-color: rgba(59, 130, 246, 0.1);
}

/* Mobile Header */
.mobile-header {
    display: none;
    height: var(--header-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0 20px;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 60;
}

.mobile-header .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-main);
    font-weight: 700;
}

.mobile-header .logo img {
    height: 28px;
}

.menu-toggle, .close-sidebar {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

.mobile-only { display: none; }

/* Responsive */
@media (max-width: 768px) {
    .mobile-header {
        display: flex;
    }
    
    .mobile-only {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        width: 100%;
        max-width: 300px;
        box-shadow: 2px 0 10px rgba(0,0,0,0.5);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding-top: calc(var(--header-height) + 20px);
    }
    
    .pricing-table th, .pricing-table td {
        padding: 10px;
        font-size: 0.9rem;
    }

    h1 { font-size: 2rem; }
}

/* Crypto Ticker */
.crypto-ticker-container {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px; /* Менее скругленный, более строгий */
    height: 48px; /* Чуть выше для читаемости */
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 0;
    box-shadow: var(--shadow);
    position: relative;
}

.crypto-ticker-container::before,
.crypto-ticker-container::after {
    content: "";
    position: absolute;
    top: 0;
    width: 50px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.crypto-ticker-container::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-surface), transparent);
}

.crypto-ticker-container::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-surface), transparent);
}

.ticker-label {
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--primary);
    padding: 0 20px;
    white-space: nowrap;
    z-index: 3;
    background: var(--bg-surface);
    height: 100%;
    display: flex;
    align-items: center;
    border-right: 1px solid var(--border-color);
    box-shadow: 5px 0 10px rgba(0,0,0,0.1);
}

.ticker-wrapper {
    flex: 1;
    overflow: hidden;
    display: flex;
}

.ticker {
    display: flex;
    white-space: nowrap;
    /* Анимация плавного бесконечного скролла */
    animation: scroll 200s linear infinite; 
}

.ticker:hover {
    animation-play-state: paused;
}

.ticker-item {
    display: inline-flex;
    align-items: center;
    padding: 0 25px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-main);
    border-right: 1px solid rgba(255,255,255,0.05);
}

.ticker-item .coin-name {
    font-weight: 700;
    margin-right: 5px;
    color: var(--text-muted);
}

.ticker-item .coin-price {
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
}

.ticker-item .coin-change {
    margin-left: 8px;
    font-size: 0.85rem;
    color: var(--success);
}

.ticker-item.down .coin-change {
    color: var(--danger);
}

/* Бесшовная анимация */
@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); } /* Сдвигаем на 50%, так как контент дублирован */
}


/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.17, 0.67, 0.83, 0.67);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Code */
code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    color: var(--accent);
    transition: background-color 0.3s;
}

/* Desktop Fix for Sidebar & Content Width */
@media (min-width: 1280px) {
    .toc-sidebar {
        display: block;
        width: 250px;
        z-index: 10;
    }
    
    .main-content {
        padding-right: 280px; /* Space for TOC */
    }

    .content-container {
        max-width: 900px; 
        margin: 0 auto; 
    }
}