/* ==========================================
   ПУТЬ В АД — Основные стили
   Концепция: Распад, Пустота, Тлеющий огонь
   ========================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600&family=Courier+Prime:ital@0;1&display=swap');

/* CSS Variables — Палитра */
:root {
    --void: #0a0a0a;
    --void-deep: #050505;
    --ash: #1a1a1a;
    --ash-light: #252525;
    --ember: #ff3d00;
    --ember-glow: #ff6b35;
    --ember-dark: #cc3000;
    --smoke: #666666;
    --smoke-light: #888888;
    --bone: #e8e4e0;
    --bone-dim: #b8b4b0;
    --rust: #8b4513;
    --rust-light: #a0522d;
    --blood: #8b0000;

    /* Typography */
    --font-display: 'Bebas Neue', sans-serif;
    --font-body: 'Source Serif 4', serif;
    --font-mono: 'Courier Prime', monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.6s ease;
}

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

/* Base */
html {
    scroll-behavior: smooth;
    font-size: 18px;
}

body {
    font-family: var(--font-body);
    background: var(--void);
    color: var(--bone);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background: var(--ember);
    color: var(--void);
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--bone);
}

h1 {
    font-size: clamp(3rem, 10vw, 8rem);
    line-height: 0.9;
}

h2 {
    font-size: clamp(1.8rem, 5vw, 3rem);
    margin-bottom: var(--space-md);
    color: var(--ember);
}

h3 {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--bone-dim);
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-sm);
    max-width: 65ch;
}

/* Links */
a {
    color: var(--ember);
    text-decoration: none;
    transition: var(--transition-fast);
    position: relative;
}

a:hover {
    color: var(--ember-glow);
}

a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--ember);
    transition: var(--transition-normal);
}

a:hover::after {
    width: 100%;
}

/* ==========================================
   LAYOUT
   ========================================== */

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.container-wide {
    max-width: 1200px;
}

/* ==========================================
   DEPTH INDICATOR — Индикатор глубины
   ========================================== */

.depth-indicator {
    position: fixed;
    left: 0;
    top: 0;
    width: 4px;
    height: 100vh;
    background: var(--ash);
    z-index: 1000;
}

.depth-indicator::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--scroll-progress, 0%);
    background: linear-gradient(
        to bottom,
        var(--ember-glow),
        var(--ember),
        var(--ember-dark),
        var(--blood)
    );
    transition: height 0.1s linear;
    box-shadow: 0 0 10px var(--ember);
}

.depth-label {
    position: fixed;
    left: 20px;
    bottom: 20px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--smoke);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    z-index: 1000;
}

/* ==========================================
   NAVIGATION
   ========================================== */

.nav-main {
    position: fixed;
    top: 0;
    right: 0;
    padding: var(--space-md);
    z-index: 1000;
}

.nav-chapters {
    display: flex;
    justify-content: space-between;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--ash-light);
    margin-top: var(--space-xl);
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--smoke);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

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

.nav-link--prev::before {
    content: '←';
}

.nav-link--next::after {
    content: '→';
}

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding: var(--space-xl) var(--space-md);
}

.hero__subtitle {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--smoke);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.hero__title {
    margin-bottom: var(--space-md);
}

.hero__author {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--smoke-light);
    margin-top: var(--space-lg);
}

.hero__scroll {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--smoke);
    letter-spacing: 0.2em;
    animation: pulse-down 2s ease-in-out infinite;
}

@keyframes pulse-down {
    0%, 100% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
    50% { opacity: 1; transform: translateX(-50%) translateY(10px); }
}

/* Hero with Cover */
.hero--with-cover {
    flex-direction: row;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-md);
    text-align: left;
    align-items: center;
    justify-content: center;
}

.hero__cover {
    flex: 0 0 auto;
    max-width: 400px;
    width: 100%;
}

.hero__cover-img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow:
        0 0 60px rgba(255, 61, 0, 0.3),
        0 25px 50px rgba(0, 0, 0, 0.8);
    transition: var(--transition-slow);
}

.hero__cover-img:hover {
    transform: scale(1.02);
    box-shadow:
        0 0 80px rgba(255, 61, 0, 0.4),
        0 30px 60px rgba(0, 0, 0, 0.9);
}

.hero__text {
    flex: 1;
    max-width: 500px;
}

.hero--with-cover .hero__subtitle {
    margin-bottom: var(--space-sm);
}

.hero--with-cover .hero__author {
    margin-top: var(--space-md);
}

@media (max-width: 900px) {
    .hero--with-cover {
        flex-direction: column;
        text-align: center;
    }

    .hero__cover {
        max-width: 320px;
    }

    .hero__text {
        max-width: none;
    }
}

/* ==========================================
   CHAPTER STYLES
   ========================================== */

.chapter {
    padding: var(--space-xl) 0;
}

.chapter__header {
    text-align: center;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--ash-light);
}

.chapter__number {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ember);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--space-sm);
}

.chapter__title {
    margin-bottom: var(--space-md);
}

/* Epigraph */
.epigraph {
    font-family: var(--font-mono);
    font-style: italic;
    color: var(--smoke-light);
    font-size: 0.9rem;
    max-width: 50ch;
    margin: 0 auto;
    text-align: center;
    position: relative;
    padding: var(--space-md);
}

.epigraph::before,
.epigraph::after {
    content: '"';
    font-size: 3rem;
    color: var(--ash-light);
    position: absolute;
    font-family: var(--font-body);
    font-style: normal;
}

.epigraph::before {
    top: -10px;
    left: 0;
}

.epigraph::after {
    bottom: -30px;
    right: 0;
}

/* Chapter Illustration */
.chapter__illustration {
    margin: var(--space-lg) auto;
    max-width: 600px;
    text-align: center;
}

.chapter__img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow:
        0 0 40px rgba(255, 61, 0, 0.2),
        0 20px 40px rgba(0, 0, 0, 0.6);
    transition: var(--transition-slow);
}

.chapter__img:hover {
    transform: scale(1.02);
    box-shadow:
        0 0 60px rgba(255, 61, 0, 0.3),
        0 25px 50px rgba(0, 0, 0, 0.7);
}

@media (max-width: 600px) {
    .chapter__illustration {
        margin: var(--space-md) auto;
    }
}

/* Content sections */
.chapter__content {
    padding: var(--space-lg) 0;
}

.chapter__content h2 {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--ash-light);
}

.chapter__content h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

/* Lists */
.chapter__content ul,
.chapter__content ol {
    margin: var(--space-sm) 0 var(--space-md) var(--space-md);
}

.chapter__content li {
    margin-bottom: var(--space-xs);
    padding-left: var(--space-xs);
}

.chapter__content ul li::marker {
    color: var(--ember);
}

/* Blockquotes */
blockquote {
    border-left: 3px solid var(--ember);
    padding-left: var(--space-md);
    margin: var(--space-md) 0;
    color: var(--bone-dim);
    font-style: italic;
}

/* Code/emphasis blocks */
.highlight-box {
    background: var(--ash);
    border: 1px solid var(--ash-light);
    padding: var(--space-md);
    margin: var(--space-md) 0;
    border-radius: 2px;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-md) 0;
    font-size: 0.9rem;
}

th, td {
    padding: var(--space-sm);
    text-align: left;
    border-bottom: 1px solid var(--ash-light);
}

th {
    font-family: var(--font-display);
    color: var(--ember);
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ==========================================
   FRACTURE — Разделитель-трещина
   ========================================== */

.fracture {
    height: 60px;
    margin: var(--space-lg) 0;
    position: relative;
    overflow: hidden;
}

.fracture::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--ash-light) 20%,
        var(--smoke) 40%,
        var(--ember) 50%,
        var(--smoke) 60%,
        var(--ash-light) 80%,
        transparent 100%
    );
}

.fracture::after {
    content: '◆';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--ember);
    font-size: 0.6rem;
    background: var(--void);
    padding: 0 var(--space-sm);
}

/* ==========================================
   TABLE OF CONTENTS — Оглавление
   ========================================== */

.toc {
    padding: var(--space-xl) 0;
}

.toc__part {
    margin-bottom: var(--space-lg);
}

.toc__part-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--smoke);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--ash-light);
}

.toc__list {
    list-style: none;
}

.toc__item {
    margin-bottom: var(--space-xs);
}

.toc__link {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    padding: var(--space-xs) 0;
    color: var(--bone-dim);
    transition: var(--transition-fast);
}

.toc__link:hover {
    color: var(--ember);
    padding-left: var(--space-sm);
}

.toc__link::after {
    display: none;
}

.toc__num {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--smoke);
    min-width: 2.5rem;
}

.toc__link:hover .toc__num {
    color: var(--ember);
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    padding: var(--space-xl) 0;
    text-align: center;
    border-top: 1px solid var(--ash-light);
    margin-top: var(--space-xl);
}

.footer__quote {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--smoke);
    font-style: italic;
}

.footer__quote-source {
    display: block;
    margin-top: var(--space-xs);
    font-style: normal;
    color: var(--smoke-light);
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }

    .container {
        padding: 0 var(--space-sm);
    }

    .hero {
        padding: var(--space-lg) var(--space-sm);
    }

    .depth-label {
        display: none;
    }

    .nav-chapters {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
}