/* ----- ЦВЕТОВАЯ СХЕМА DEVSKILLROAD ----- */
:root {
    --bg-page: #0A0A0A;
    --bg-card: #1F1F1F;
    --bg-hover: #2A2A2A;
    --text-main: #E0E0E0;
    --text-dim: #cecece;
    --accent-primary: #00E5FF;
    --accent-secondary: #FF8C42;
}

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

body {
    background-color: var(--bg-page);
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-size: 18px;
    line-height: 1.6;
}

/* ===== ШАПКА ===== */
.site-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid rgba(0, 229, 255, 0.2);
    padding: 16px 0;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-left: 16px;
    margin-right: 16px;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon svg {
    width: 64px;
    height: 64px;
}

.logo-text {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-primary);
    letter-spacing: 1px;
}

.main-nav {
    display: flex;
    gap: 32px;
}

.main-nav a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 18px;
    transition: color 0.2s;
}

.main-nav a:hover {
    color: var(--accent-primary);
}

/* ===== ОСНОВНАЯ СЕТКА ===== */
.main-container {
    display: flex;
    margin: 24px 16px;
    gap: 24px;
    flex: 1;
}

/* ===== ЛЕВАЯ КОЛОНКА (МЕНЮ) ===== */
.sidebar {
    width: 320px;
    flex-shrink: 0;
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    height: fit-content;
    position: sticky;
    top: 16px;
    border: 1px solid rgba(0, 229, 255, 0.1);
}

.sidebar h3 {
    color: var(--accent-primary);
    font-size: 20px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--accent-secondary);
}

/* НАВИГАЦИЯ ПО УРОКАМ */
.lesson-nav {
    list-style: none;
}

.lesson-nav .course-title {
    font-weight: 600;
    color: var(--accent-secondary);
    display: block;
    margin-bottom: 8px;
    font-size: 18px;
    letter-spacing: 0.5px;
}

.lesson-nav .sub-list {
    list-style: none;
    padding-left: 8px;
}

.lesson-nav .sub-list li {
    margin: 4px 0;
}

.lesson-nav .sub-list a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 16px;
    display: block;
    padding: 6px 10px;
    border-radius: 8px;
    transition: all 0.2s;
}

.lesson-nav .sub-list a:hover {
    color: var(--accent-primary);
    background: rgba(0, 229, 255, 0.1);
}

.lesson-nav .sub-list .current {
    color: var(--accent-primary);
    background: rgba(0, 229, 255, 0.15);
    border-left: 3px solid var(--accent-secondary);
}

/* БУРГЕР-КНОПКА (только на мобилках) */
.burger-btn {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--accent-primary);
    border-radius: 12px;
    padding: 12px 16px;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.burger-btn .line {
    width: 100%;
    height: 2px;
    background-color: var(--accent-primary);
    transition: all 0.2s;
}

.burger-btn:hover {
    background: var(--accent-primary);
}

.burger-btn:hover .line {
    background-color: #0A0A0A;
}

@media (max-width: 768px) {
    .burger-btn {
        display: flex;
    }
    
    .sidebar {
        display: none;
        width: 100%;
        margin-top: 16px;
    }
    
    .sidebar.show {
        display: block;
    }
    
    .main-container {
        flex-direction: column;
    }
}

@media (min-width: 769px) {
    .burger-btn {
        display: none;
    }
}

/* ===== КОНТЕНТ ===== */
.content {
    flex: 1;
    background-color: var(--bg-card);
    border-radius: 24px;
    padding: 32px;
    border: 1px solid rgba(0, 229, 255, 0.08);
    min-width: 0;
}

.content h2 {
    color: var(--accent-primary);
    font-size: 32px;
    margin-bottom: 20px;
    border-left: 4px solid var(--accent-secondary);
    padding-left: 20px;
}

.content h3 {
    color: var(--accent-secondary);
    font-size: 24px;
    margin: 30px 0 16px 0;
}

.content p, .content li {
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-dim);
}

.content ul, .content ol {
    margin: 16px 0 20px 25px;
}

/* БЛОКИ КОДА */
pre, .code-block {
    background: #0A0A0A;
    padding: 20px;
    border-radius: 16px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 16px;
    overflow-x: auto;
    margin: 24px 0;
    border: 1px solid rgba(0, 229, 255, 0.2);
    color: var(--accent-primary);
    line-height: 1.5;
}

/* ЗАМЕТКИ, ЗАДАНИЯ, ЦИТАТЫ */
.note, .task, .warning {
    padding: 20px;
    margin: 24px 0;
    border-radius: 16px;
    font-size: 16px;
    line-height: 1.5;
}

.note {
    background: rgba(255, 140, 66, 0.1);
    border-left: 4px solid var(--accent-secondary);
}

.task {
    background: rgba(0, 229, 255, 0.05);
    border-left: 4px solid var(--accent-primary);
}

.warning {
    background: rgba(255, 68, 68, 0.1);
    border-left: 4px solid #ff4444;
}

hr {
    margin: 40px 0;
    border: none;
    height: 1px;
    background: linear-gradient(90deg, var(--accent-primary), transparent);
}

/* КНОПКИ НАВИГАЦИИ МЕЖДУ УРОКАМИ */
.lesson-nav-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 229, 255, 0.2);
    gap: 16px;
}

.lesson-nav-prev, .lesson-nav-next {
    padding: 12px 28px;
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid rgba(0, 229, 255, 0.3);
    border-radius: 40px;
    color: var(--text-dim);
    text-decoration: none;
    transition: all 0.2s;
    font-size: 16px;
    font-weight: 500;
    text-align: center;
}

.lesson-nav-prev:hover, .lesson-nav-next:hover {
    background: var(--accent-primary);
    color: #0A0A0A;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ПОДВАЛ */
.site-footer {
    text-align: center;
    padding: 24px;
    font-size: 14px;
    color: #666;
    border-top: 1px solid rgba(0, 229, 255, 0.1);
    margin-top: 40px;
}

/* ЭЛЕМЕНТЫ ДЛЯ ГЛАВНОЙ СТРАНИЦЫ */
.full-list {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 24px;
    padding: 24px;
    margin: 30px 0;
    border: 1px solid rgba(0, 229, 255, 0.1);
}

.full-list h3 {
    margin-top: 0;
}

.tech-items {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 30px 0 0;
}

.tech-item {
    background: rgba(0, 229, 255, 0.1);
    padding: 8px 20px;
    border-radius: 40px;
    font-size: 14px;
    color: var(--accent-primary);
    border: 1px solid rgba(0, 229, 255, 0.2);
    font-weight: 500;
}

/* АДАПТИВ */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
    
    .site-header .container {
        justify-content: center;
        text-align: center;
    }
    
    .logo-text {
        font-size: 22px;
    }
    
    .logo-icon svg {
        width: 48px;
        height: 48px;
    }
    
    .main-nav {
        gap: 20px;
    }
    
    .content {
        padding: 24px;
    }
    
    .content h2 {
        font-size: 28px;
        padding-left: 16px;
    }
    
    .content h3 {
        font-size: 22px;
    }
    
    pre, .code-block {
        padding: 16px;
        font-size: 14px;
    }
    
    .lesson-nav-buttons {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    .content {
        padding: 16px;
    }
    
    .content h2 {
        font-size: 24px;
    }
    
    .content h3 {
        font-size: 20px;
    }
    
    .note, .task {
        padding: 16px;
    }
    
    .full-list {
        padding: 16px;
    }
}