/* ===== БАЗОВЫЕ СТИЛИ INTERBELLUM (METROPOLIS VARIANT) ===== */
:root {
    --color-primary: #8B0000;
    --color-secondary: #003366;
    --color-accent: #D4AF37;
    --color-background: #F5E6CA;
    --color-surface: #E8D9B5;
    --color-text: #2C1810;
    --color-border: #8B4513;
    --color-mahogany: #4A0100;
    --color-ivory: #FFFFF0;
    --color-bronze: #CD7F32;
    --font-heading:
            "Palatino Linotype",
            "Book Antiqua",
            "Palatino",
            "Georgia",
            serif;
    --font-body: "Georgia", "Times New Roman", "Palatino", serif;
    --font-mono: "Courier New", "Courier", monospace;
    --border-radius: 4px;
    --border-width: 2px;
    --shadow-sm: 0 4px 12px rgba(139, 69, 19, 0.15);
    --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
    --gold-gradient: linear-gradient(
            135deg,
            #D4AF37 0%,
            #B8860B 50%,
            #D4AF37 100%
    );
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    scroll-behavior: smooth;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== ШАПКА С НАВИГАЦИЕЙ ===== */
.site-header {
    background: var(--color-ivory);
    border-bottom: 6px double var(--color-accent);
    border-top: 2px solid var(--color-accent);
    top: 0;
    padding: 1.5rem;
    z-index: 1000;
    backdrop-filter: blur(4px);
    background-color: rgba(255, 255, 240, 0.95);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1px 0;
}

.logo h1 {
    font-size: 1.6rem;
    margin: 0;
    letter-spacing: 4px;
    border-left: 4px solid var(--color-accent);
    padding-left: 0.8rem;
}

.logo p {
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--color-bronze);
    margin-top: 0.2rem;
}

.main-nav ul {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.main-nav a {
    font-family: var(--font-heading);
    text-transform: uppercase;
    font-weight: 500;
    letter-spacing: 1px;
    text-decoration: none;
    color: var(--color-text);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

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

/* ===== ГЕРОЙ-СЕКЦИЯ ===== */
.hero {
    background: linear-gradient(105deg, var(--color-mahogany) 0%, #2a0c0a 100%);
    color: var(--color-ivory);
    padding: 4rem 2rem;
    text-align: center;
    border-bottom: 4px solid var(--color-accent);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: repeating-linear-gradient(45deg, transparent, transparent 30px, rgba(212, 175, 55, 0.05) 30px, rgba(212, 175, 55, 0.1) 60px);
    pointer-events: none;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    letter-spacing: 4px;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.3);
}

.hero .subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}

/* ===== СЕКЦИИ ===== */
section {
    scroll-margin-top: 100px;
    max-width: 720pt;
    margin: 4rem auto;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 2rem;
    display: inline-block;
    border-bottom: 3px solid var(--color-accent);
    padding-bottom: 0.3rem;
    color: var(--color-secondary);
}

/* Карточки и сетки */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--color-surface);
    border-left: 5px solid var(--color-accent);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card h3 {
    margin-bottom: 0.8rem;
    color: var(--color-mahogany);
}

.card p {
    margin-bottom: 1rem;
    flex-grow: 1;
}

.card .btn {
    align-self: flex-start;
    margin-top: 0.5rem;
}

.btn {
    display: inline-block;
    background: transparent;
    border: 2px solid var(--color-accent);
    padding: 0.5rem 1.2rem;
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: bold;
    color: var(--color-text);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-size: 0.85rem;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-mahogany);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-bronze);
    border-color: var(--color-bronze);
    color: var(--color-ivory);
}

/* Специальный стиль для секций-порталов */
.portal-section {
    background: var(--color-surface);
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.portal-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.portal-section p {
    max-width: 600px;
    margin: 0 auto 1.5rem auto;
}

/* Визуализации */
.viz-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 1.5rem;
    justify-content: space-between;
}

.viz-card {
    flex: 1;
    min-width: 250px;
    background: var(--color-surface);
    padding: 1.5rem;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.viz-card h3 {
    text-align: center;
    margin-bottom: 1rem;
}

canvas, .mermaid, .code-block, .katex-demo {
    margin-top: 1rem;
}

.code-block pre {
    background: #1e1e1e;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
}

/* Подвал */
.site-footer {
    background: var(--color-mahogany);
    color: var(--color-ivory);
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 4px solid var(--color-accent);
    text-align: center;
}

/* Адаптивность */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        text-align: center;
    }
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .section-title {
        font-size: 1.6rem;
    }
    .viz-container {
        flex-direction: column;
    }
}