/* ============================================
   VARIABLES CSS
   ============================================ */
:root {
    /* Bootstrap variables base */
    --bs-blue: #0d6efd;
    --bs-indigo: #6610f2;
    --bs-purple: #6f42c1;
    --bs-pink: #d63384;
    --bs-red: #dc3545;
    --bs-orange: #fd7e14;
    --bs-yellow: #ffc107;
    --bs-green: #198754;
    --bs-teal: #20c997;
    --bs-cyan: #0dcaf0;
    --bs-black: #000;
    --bs-white: #fff;
    --bs-gray: #6c757d;
    --bs-gray-dark: #343a40;
    --bs-primary: #434E5E;
    --bs-secondary: #58677c;

    /* Custom Variables - Sistema de Diseño */

    /* Colores principales */
    --color-primary: #434E5E;
    --color-primary-dark: #2C3440;
    --color-primary-light: #5C687A;

    /* Backgrounds */
    --color-bg-main: #FFFFFF;
    --color-bg-subtle: #F8F9FA;
    --color-bg-card: #FFFFFF;

    /* Textos */
    --color-text-primary: #1A1D23;
    --color-text-secondary: #5C687A;
    --color-text-muted: #8A94A6;

    /* Acentos */
    --color-accent: #7C89A0;
    --color-accent-light: #A8B4C7;

    /* Estados */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-border: #E5E7EB;
    --color-shadow: rgba(67, 78, 94, 0.08);

    /* Hover states */
    --color-hover-overlay: rgba(67, 78, 94, 0.04);

    /* Tipografía */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    --font-serif: 'Lora', Georgia, serif;

    /* Tamaños de texto */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */

    /* Pesos */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Line heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* Espaciado (sistema base 8px) */
    --space-xs: 0.5rem;    /* 8px */
    --space-sm: 1rem;      /* 16px */
    --space-md: 1.5rem;    /* 24px */
    --space-lg: 2rem;      /* 32px */
    --space-xl: 3rem;      /* 48px */
    --space-2xl: 4rem;     /* 64px */
    --space-3xl: 6rem;     /* 96px */

    /* Contenedores */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1200px;
}

/* ============================================
   RESET Y BASE
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg-main);
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
    line-height: var(--leading-normal);
}

a {
    color: var(--color-primary);
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

/* ============================================
   NAVBAR COMPONENT
   ============================================ */
.navbar-custom {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    transition: box-shadow 0.3s ease;
}

.navbar-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--text-lg);
}

.navbar-brand:hover {
    color: var(--color-primary);
}

.brand-icon {
    font-size: 1.5rem;
}

.navbar-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
}

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

@media (max-width: 768px) {
    .navbar-container {
        padding: 0 1rem;
    }

    .navbar-links {
        gap: 1rem;
    }

    .brand-text {
        display: none;
    }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-2xl) 2rem;
    text-align: center;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: var(--text-5xl);
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    line-height: var(--leading-tight);
    font-weight: var(--font-bold);
}

.hero-description {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    font-style: italic;
    margin: 0;
}

@media (max-width: 768px) {
    .hero-section {
        padding: var(--space-xl) 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: var(--text-base);
    }
}

/* ============================================
   CATALOG SECTION
   ============================================ */
.catalog-section {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: var(--space-2xl) 2rem;
}

.catalog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .catalog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .catalog-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1280px) {
    .catalog-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .catalog-section {
        padding: var(--space-xl) 1rem;
    }
}

/* ============================================
   BOOK CARD COMPONENT
   ============================================ */
.book-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.book-card__link {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--color-shadow);
    border-color: var(--color-primary);
}

.book-card__image-wrapper {
    position: relative;
    background: var(--color-bg-subtle);
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 350px;
}

.book-card__image {
    max-width: 100%;
    height: auto;
    max-height: 300px;
    object-fit: contain;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.book-card:hover .book-card__image {
    transform: scale(1.05);
}

.book-card__badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-warning {
    background: #FEF3C7;
    color: #D97706;
}

.badge-success {
    background: #ECFDF5;
    color: #059669;
}

.book-card__content {
    padding: var(--space-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-card__title {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
    line-height: var(--leading-tight);
}

.book-card__description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin: 0;
}

/* ============================================
   BOOK DETAIL PAGE
   ============================================ */
.book-detail {
    min-height: 70vh;
    padding: var(--space-2xl) 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-detail__container {
    max-width: 600px;
    text-align: center;
}

.book-detail__image-wrapper {
    margin-bottom: 2rem;
}

.book-detail__image {
    max-width: 100%;
    height: auto;
    max-width: 400px;
    border-radius: 8px;
    box-shadow: 0 10px 30px var(--color-shadow);
}

.book-detail__title {
    font-family: var(--font-serif);
    font-size: var(--text-3xl);
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    font-weight: var(--font-bold);
}

.book-detail__description {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: 2rem;
}

.book-detail__actions {
    display: flex;
    gap: 1rem;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 640px) {
    .book-detail__actions {
        flex-direction: row;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .book-detail {
        padding: var(--space-xl) 1rem;
    }

    .book-detail__title {
        font-size: var(--text-2xl);
    }

    .book-detail__description {
        font-size: var(--text-base);
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn-primary-custom {
    background: var(--color-primary);
    color: white;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: var(--font-semibold);
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: var(--text-base);
}

.btn-primary-custom:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(67, 78, 94, 0.2);
    color: white;
}

.btn-primary-custom:active {
    transform: translateY(0);
}

.btn-ghost {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-border);
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: var(--font-semibold);
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-block;
    cursor: pointer;
    font-size: var(--text-base);
}

.btn-ghost:hover {
    border-color: var(--color-primary);
    background: var(--color-hover-overlay);
    color: var(--color-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer-custom {
    background: var(--color-bg-subtle);
    border-top: 1px solid var(--color-border);
    padding: var(--space-2xl) 2rem;
    margin-top: var(--space-2xl);
}

.footer-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.footer-title {
    font-family: var(--font-serif);
    font-size: var(--text-2xl);
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    font-weight: var(--font-bold);
}

.footer-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-size: var(--text-base);
}

.footer-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
    font-weight: var(--font-medium);
}

.footer-link:hover {
    color: var(--color-primary);
}

.footer-note {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-style: italic;
    margin: 0;
    line-height: var(--leading-relaxed);
}

@media (max-width: 768px) {
    .footer-custom {
        padding: var(--space-xl) 1rem;
    }

    .footer-links {
        gap: 1rem;
    }
}

/* ============================================
   UTILITIES
   ============================================ */
.text-balance {
    text-wrap: balance;
}

.container-custom {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 768px) {
    .container-custom {
        padding: 0 1rem;
    }
}