/* ========================================================================= */
/* --- ГЛОБАЛЬНЫЕ СТИЛИ И ПЕРЕМЕННЫЕ --- */
/* ========================================================================= */
:root {
    --black: #0a0a0a;
    --dark-grey: #1a1a1a;
    --grey: #333333;
    --off-white: #E0E0E0;
    --white: #FFFFFF;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--black);
    color: var(--off-white);
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    overflow-x: hidden;
}

/* ========================================================================= */
/* --- СТИЛИ ДЛЯ ГЛАВНОЙ СТРАНИЦЫ (index.html) --- */
/* ========================================================================= */

/* --- Фон с частицами --- */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

/* --- Шапка --- */
header {
    position: fixed;
    width: 100%;
    padding: 25px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: rgba(10, 10, 10, 0.5);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    font-size: 1.8em;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--white);
}

nav a {
    color: var(--off-white);
    text-decoration: none;
    margin-left: 40px;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--white);
}

/* --- Главный экран (Hero) --- */
#hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 6vw, 5rem); /* Адаптивный размер шрифта */
    font-weight: 800;
    color: var(--white);
    letter-spacing: -2px;
}

.typing-effect {
    color: var(--white);
}

.cursor {
    display: inline-block;
    color: var(--white);
    animation: blink 0.8s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.subtitle {
    margin-top: 20px;
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    max-width: 600px;
    line-height: 1.6;
    color: #c5c5c5;
}

.cta-button {
    display: inline-block;
    margin-top: 50px;
    padding: 18px 35px;
    border: 1px solid var(--grey);
    border-radius: 50px;
    color: var(--off-white);
    background-color: transparent;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1em;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

.cta-button:hover {
    background-color: var(--white);
    color: var(--black);
    border-color: var(--white);
}

/* --- Общие стили секций на главной --- */
main > section {
    padding: 120px 8%;
}

section h2 {
    font-size: 3em;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 50px;
    text-align: center;
}
section#about p {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    line-height: 1.8;
    font-size: 1.1em;
}

/* --- Анимация появления при скролле --- */
.hidden {
    opacity: 0;
    filter: blur(5px);
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out, filter 0.6s ease-out;
}

.visible {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
}

/* --- Подвал --- */
footer {
    text-align: center;
    padding: 50px;
    color: #666;
    border-top: 1px solid var(--grey);
}


/* ========================================================================= */
/* --- СТИЛИ ДЛЯ СТРАНИЦЫ КУРСОВ (courses.html) --- */
/* ========================================================================= */

body.courses-page {
    counter-reset: accordion-counter;
}

#course-hero {
    padding-top: 150px;
    padding-bottom: 80px;
    text-align: center;
}

#course-hero h1 {
    font-size: 3.5em;
    font-weight: 800;
    color: var(--white);
}

#course-hero p {
    font-size: 1.2em;
    color: #c5c5c5;
    margin-top: 10px;
}

#course-list {
    padding: 40px 8% 120px 8%;
}

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

.section-title {
    font-size: 1.2em;
    font-weight: 600;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-top: 60px;
    margin-bottom: 20px;
}
.section-title:first-of-type {
    margin-top: 0;
}

.accordion-item {
    background-color: var(--dark-grey);
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--grey);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.accordion-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    border-color: #666;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    cursor: pointer;
    position: relative;
}

.accordion-header::before {
    counter-increment: accordion-counter;
    content: "0" counter(accordion-counter);
    position: absolute;
    left: -20px;
    top: 50%;
    transform: translateY(-50%) rotate(-90deg);
    font-size: 3.5em;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.05);
    transition: color 0.3s ease;
    -webkit-text-stroke: 1px rgba(255, 255, 255, 0.1);
}
.accordion-item:hover .accordion-header::before {
    color: rgba(255, 255, 255, 0.08);
}

.title-group {
    padding-left: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.accordion-header h3 {
    color: var(--white);
    font-size: 1.6em;
    font-weight: 700;
    line-height: 1.2;
    transition: color 0.3s;
}

.duration {
    color: #a0a0a0;
    font-size: 1em;
    margin-left: auto;
    padding-left: 20px;
    flex-shrink: 0;
}

.accordion-toggle {
    background: var(--grey);
    border: none;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: transform 0.5s cubic-bezier(0.19, 1, 0.22, 1), background-color 0.3s;
    flex-shrink: 0;
}

.accordion-toggle svg {
    stroke: var(--off-white);
    width: 24px;
    height: 24px;
    stroke-width: 2.5;
    fill: none;
}

.accordion-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.7s cubic-bezier(0.19, 1, 0.22, 1), opacity 0.5s ease-out;
    padding: 0 30px 0 75px;
}

.accordion-content p {
    color: #c5c5c5;
    line-height: 1.7;
    margin: 15px 0 25px 0;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s ease 0.2s, transform 0.5s ease 0.2s;
}

.accordion-content ul {
    list-style: none;
    padding-left: 0;
}

.accordion-content ul li {
    color: var(--off-white);
    margin-bottom: 12px;
    position: relative;
    padding-left: 25px;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.accordion-content ul li::before {
    content: '>';
    font-family: monospace;
    color: var(--white);
    font-weight: bold;
    font-size: 1.2em;
    position: absolute;
    left: 0;
    top: 1px;
}

.accordion-item.active {
    border-color: var(--white);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

.accordion-item.active .accordion-toggle {
    transform: rotate(180deg);
    background-color: var(--white);
}
.accordion-item.active .accordion-toggle svg {
    stroke: var(--black);
}

.accordion-item.active .accordion-content {
    max-height: 1200px;
    opacity: 1;
    padding-bottom: 30px;
}

.accordion-item.active .accordion-content p,
.accordion-item.active .accordion-content ul li {
    opacity: 1;
    transform: translateY(0);
}

.accordion-item.active .accordion-content ul li:nth-child(1) { transition-delay: 0.25s; }
.accordion-item.active .accordion-content ul li:nth-child(2) { transition-delay: 0.30s; }
.accordion-item.active .accordion-content ul li:nth-child(3) { transition-delay: 0.35s; }
.accordion-item.active .accordion-content ul li:nth-child(4) { transition-delay: 0.40s; }

.checkmark {
    color: var(--white);
    font-size: 1.5em;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.7);
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.accordion-item.completed .checkmark {
    opacity: 1;
    transform: scale(1);
}

.accordion-item.completed .accordion-header h3 {
    color: #a0a0a0;
}
.accordion-item.completed:hover .accordion-header h3 {
    color: var(--white);
}

.lesson-link {
    display: inline-block;
    text-decoration: none;
    margin-top: 25px;
    padding: 12px 25px;
    border: 1px solid var(--grey);
    border-radius: 5px;
    color: var(--off-white);
    background-color: var(--dark-grey);
    font-weight: 600;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

.lesson-link:hover {
    background-color: var(--white);
    color: var(--black);
    border-color: var(--white);
}

/* ========================================================================= */
/* --- СТИЛИ ДЛЯ СТРАНИЦ УРОКОВ (lesson-*.html) --- */
/* ========================================================================= */

.lesson-page header {
    border-bottom: 1px solid var(--grey);
}

.lesson-hero {
    background-color: var(--dark-grey);
    padding: 100px 8%;
    border-bottom: 1px solid var(--grey);
}
.lesson-hero-content {
    max-width: 900px;
}
.lesson-meta {
    display: inline-block;
    background-color: var(--grey);
    color: var(--white);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 600;
    margin-bottom: 20px;
}
.lesson-hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 15px;
    line-height: 1.2;
}
.lesson-hero p {
    font-size: 1.25em;
    color: #c5c5c5;
    line-height: 1.6;
    max-width: 800px;
}

.lesson-container {
    display: flex;
    gap: 60px;
    padding: 60px 8%;
    align-items: flex-start;
}

.lesson-nav {
    position: sticky;
    top: 120px;
    width: 250px;
    flex-shrink: 0;
}
.lesson-nav h3 {
    font-size: 1.2em;
    font-weight: 700;
    color: var(--white);
    padding-bottom: 15px;
    border-bottom: 1px solid var(--grey);
    margin-bottom: 15px;
}
.lesson-nav ul { list-style: none; }
.lesson-nav li { margin-bottom: 5px; }
.lesson-nav a {
    display: block;
    text-decoration: none;
    color: #a0a0a0;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s, border-left-color 0.3s;
    border-left: 3px solid transparent;
}
.lesson-nav a:hover {
    color: var(--white);
    background-color: var(--dark-grey);
}
.lesson-nav a.active {
    color: var(--white);
    background-color: var(--grey);
    font-weight: 600;
    border-left: 3px solid var(--white);
}

.lesson-content {
    flex-grow: 1;
    min-width: 0;
}
.lesson-content section {
    margin-bottom: 80px;
    padding-top: 20px;
}
.lesson-content h2 {
    font-size: 2.4em;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--grey);
    text-align: left;
}
.lesson-content h3 {
    font-size: 1.5em;
    font-weight: 700;
    color: var(--off-white);
    margin-top: 40px;
    margin-bottom: 15px;
}
.lesson-content p, .lesson-content li {
    font-size: 1.1em;
    line-height: 1.9;
    color: var(--off-white);
    margin-bottom: 1.2em;
}
.lesson-content a {
    color: #58a6ff;
    text-decoration: none;
    border-bottom: 1px dotted #58a6ff;
    transition: color 0.3s, border-bottom-color 0.3s;
}
.lesson-content a:hover {
    color: var(--white);
    border-bottom-color: var(--white);
}
.lesson-content strong {
    color: var(--white);
    font-weight: 700;
}
.lesson-content ul, .lesson-content ol {
    padding-left: 30px;
}
.lesson-content ul li::marker, .lesson-content ol li::marker {
    color: #888;
}

.code-block {
    background-color: #0d0d0d;
    border: 1px solid var(--grey);
    border-radius: 8px;
    padding: 20px;
    margin: 30px 0;
    position: relative;
    overflow-x: auto;
}
.code-block code {
    font-family: 'Roboto Mono', monospace;
    font-size: 1em;
    color: #e0e0e0;
    white-space: pre;
}
.copy-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--grey);
    color: var(--off-white);
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s, background-color 0.3s;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
}
.code-block:hover .copy-btn {
    opacity: 1;
}
.copy-btn:hover {
    background-color: #555;
}

.info-box, .warning-box, .pro-tip-box {
    padding: 20px 25px;
    margin: 30px 0;
    border-radius: 8px;
    border-left: 4px solid;
}
.info-box p, .warning-box p, .pro-tip-box p { margin: 0; }
.info-box {
    background-color: rgba(52, 152, 219, 0.1);
    border-color: #3498db;
}
.warning-box {
    background-color: rgba(231, 76, 60, 0.1);
    border-color: #e74c3c;
}
.pro-tip-box {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: #888;
}

.ascii-diagram {
    background-color: transparent;
    font-family: 'Roboto Mono', monospace;
    color: #a0a0a0;
    padding: 20px 0;
    font-size: 1em;
    line-height: 1.5;
    white-space: pre;
    overflow-x: auto;
}

.lesson-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
}
.lesson-content th, .lesson-content td {
    padding: 15px;
    border: 1px solid var(--grey);
    text-align: left;
}
.lesson-content th {
    background-color: var(--dark-grey);
    color: var(--white);
    font-weight: 700;
}
.lesson-content tbody tr:nth-child(even) {
    background-color: #111;
}

/* ========================================================================= */
/* --- АДАПТИВНОСТЬ --- */
/* ========================================================================= */
@media (max-width: 1024px) {
    .lesson-container {
        flex-direction: column;
    }
    .lesson-nav {
        position: static;
        width: 100%;
        margin-bottom: 40px;
        border-bottom: 1px solid var(--grey);
        padding-bottom: 20px;
    }
}

@media (max-width: 768px) {
    header {
        padding: 20px 5%;
        flex-direction: column;
        gap: 15px;
    }
    nav a { 
        margin: 0 15px;
    }
    main > section, #course-list, .lesson-container { 
        padding-left: 5%;
        padding-right: 5%;
    }
}
/* Контейнер-сетка для карточек */
.roadmap-grid {
    display: grid;
    /* Адаптивная сетка: создает столько колонок, сколько помещается, 
       при минимальной ширине колонки 320px */
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px; /* Отступ между карточками */
}

/* Стили для новой карточки */
.roadmap-card-new {
    display: block; /* Чтобы тег <a> вел себя как блок */
    text-decoration: none; /* Убираем подчеркивание у ссылки */
    padding: 35px;
    
    /* Эффект "матового стекла" */
    background-color: rgba(26, 26, 26, 0.7); /* Полупрозрачный фон */
    backdrop-filter: blur(5px); /* Размытие фона под карточкой */
    
    border: 1px solid var(--grey);
    border-radius: 12px;
    transition: all 0.3s ease;
}

/* Эффект при наведении */
.roadmap-card-new:hover {
    transform: translateY(-8px); /* Карточка "приподнимается" */
    border-color: var(--white); /* Рамка становится белой */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5); /* Добавляем тень для объема */
}

/* Номер модуля */
.card-number {
    display: block;
    font-size: 1em;
    font-weight: 600;
    color: #888;
    margin-bottom: 20px;
}

/* Заголовок модуля */
.roadmap-card-new h3 {
    color: var(--white);
    font-size: 1.6em;
    font-weight: 700;
    margin-bottom: 15px;
}

/* Описание модуля */
.roadmap-card-new p {
    color: #a0a0a0;
    line-height: 1.7;
    font-size: 1.05em;
}