/* =========================================
   POLIMATÍA EDICIONES - BASE STYLES
   ========================================= */

:root {
    /* Color Palette: Editorial, Premium, Minimalist */
    --color-bg-dark: #0f1115;
    --color-bg-light: #161a20;
    --color-text-main: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-accent: #f8fafc;
    --color-border: #334155;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    
    /* Spacing & Layout */
    --container-width: 1100px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg-dark);
    color: var(--color-text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-accent);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}

a:hover {
    opacity: 0.8;
}

p {
    margin-bottom: 1.5rem;
    color: var(--color-text-muted);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.text-center {
    text-align: center;
}

.center-text {
    text-align: center;
}

/* =========================================
   BUTTONS
   ========================================= */

.btn-primary, .btn-outline {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg-dark);
    border: 1px solid var(--color-accent);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.05);
}

/* =========================================
   HEADER & NAVIGATION
   ========================================= */

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: rgba(15, 17, 21, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.5px;
}

.main-nav {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.main-nav a {
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.main-nav a:not(.btn-outline) {
    position: relative;
}

.main-nav a:not(.btn-outline)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

.main-nav a:not(.btn-outline):hover::after {
    width: 100%;
}

/* =========================================
   SECTIONS
   ========================================= */

section {
    padding: var(--spacing-xl) 0;
}

.section-dark {
    background-color: var(--color-bg-dark);
}

.section-light {
    background-color: var(--color-bg-light);
    border-top: 1px solid rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

.hero {
    height: 80vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Subtle background gradient */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(51, 65, 85, 0.15) 0%, rgba(15, 17, 21, 1) 70%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    padding: 0 var(--spacing-md);
    animation: fadeIn 1s ease-out forwards;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 400;
    font-style: italic;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================
   ENFOQUE (TEXT COLUMNS)
   ========================================= */

.text-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

#nuestro-enfoque h2 {
    font-size: 3rem;
    font-style: italic;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 1rem;
}

.text-columns p {
    font-size: 1.1rem;
    line-height: 1.8;
}

/* =========================================
   AUTHOR GRID
   ========================================= */

.author-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    justify-content: center;
}

.author-card {
    background-color: var(--color-bg-dark);
    padding: var(--spacing-lg) var(--spacing-md);
    border: 1px solid var(--color-border);
    text-align: center;
    border-radius: 2px;
    transition: transform 0.3s ease;
}

.author-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.2);
}

.author-image-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background-color: var(--color-border);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 2rem;
    margin: 0 auto 1.5rem auto;
}

.author-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.author-bio {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.author-link {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 2px;
}

.author-link:hover {
    border-color: var(--color-accent);
}

/* =========================================
   CATALOG GRID
   ========================================= */

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.book-card {
    text-align: center;
}

.book-cover-placeholder {
    width: 100%;
    aspect-ratio: 2 / 3;
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-sans);
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.book-card:hover .book-cover-placeholder {
    transform: scale(1.02);
    border-color: var(--color-accent);
}

.book-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.book-card p {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.site-footer {
    background-color: var(--color-bg-dark);
    padding: var(--spacing-lg) 0 var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-brand p {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    text-align: right;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.05);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

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

@media (max-width: 768px) {
    .site-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .hero h1 {
        font-size: 3rem;
    }
    
    .text-columns {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .footer-links {
        text-align: center;
        width: 100%;
    }
}