/* =============================================
   SISTEMA DE DISEÑO - CURSOSONLINEREVIEWS.COM
   ============================================= */

/* Reset y base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Sistema de colores (60-30-10) */
    --primary-100: #EBF5FF;
    --primary-500: #007BFF;
    --primary-700: #0056b3;
    
    --neutral-50: #F8F9FA;
    --neutral-100: #FFFFFF;
    --neutral-400: #6C757D;
    --neutral-900: #212529;
    
    --success: #28A745;
    --warning: #FFC107;
    --error: #DC3545;
    
    /* Tipografía */
    --font-family: 'Inter', sans-serif;
    
    /* Espaciado (sistema de 8px) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;
    --space-xxxl: 96px;
    
    /* Sombras */
    --shadow-card: 0 8px 24px rgba(0, 31, 63, 0.08);
    --shadow-card-hover: 0 12px 32px rgba(0, 31, 63, 0.12);
    
    /* Bordes */
    --radius-sm: 8px;
    --radius-md: 12px;
    
    /* Layout */
    --container-max-width: 1280px;
    --content-max-width: 720px;
}

/* Base */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--neutral-900);
    background-color: var(--neutral-50);
    font-size: 18px;
}

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

/* Tipografía */
h1, .h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h2, .h2 {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--space-sm);
}

h3, .h3 {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--space-xs);
}

p {
    margin-bottom: var(--space-sm);
}

/* =============================================
   HEADER Y NAVEGACIÓN
   ============================================= */

.header {
    background: var(--neutral-100);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand .brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--neutral-900);
    font-weight: 700;
    font-size: 20px;
}

.brand-icon {
    color: var(--primary-500);
    margin-right: var(--space-xs);
    font-size: 24px;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--neutral-400);
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-500);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--neutral-900);
    transition: 0.3s;
}

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

.hero {
    background: var(--neutral-50);
    padding: var(--space-xxxl) 0;
    text-align: center;
}

.hero-title {
    color: var(--neutral-900);
    margin-bottom: var(--space-sm);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--neutral-400);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-container {
    margin-bottom: var(--space-xl);
}

.search-box {
    display: flex;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    background: var(--neutral-100);
    border-radius: var(--radius-md);
    padding: var(--space-xs);
    box-shadow: var(--shadow-card);
}

.search-icon {
    color: var(--neutral-400);
    margin: 0 var(--space-sm);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
    padding: var(--space-sm);
    background: transparent;
}

.search-btn {
    background: var(--primary-500);
    color: var(--neutral-100);
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.search-btn:hover {
    background: var(--primary-700);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-500);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 14px;
    color: var(--neutral-400);
    font-weight: 500;
}

/* =============================================
   CATEGORÍAS
   ============================================= */

.categories {
    padding: var(--space-xxl) 0;
    background: var(--neutral-100);
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--neutral-900);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.category-card {
    background: var(--neutral-100);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
    text-decoration: none;
    color: var(--neutral-900);
    box-shadow: var(--shadow-card);
    transition: all 0.25s ease-out;
    border: 1px solid rgba(0, 123, 255, 0.1);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--primary-500);
}

.category-icon {
    background: var(--primary-100);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    color: var(--primary-500);
    font-size: 24px;
}

.category-title {
    margin-bottom: var(--space-xs);
    color: var(--neutral-900);
}

.category-count {
    font-size: 14px;
    color: var(--neutral-400);
    margin: 0;
}

/* =============================================
   ÚLTIMAS RESEÑAS
   ============================================= */

.latest-reviews {
    padding: var(--space-xxl) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.view-all-link {
    color: var(--primary-500);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: color 0.2s ease;
}

.view-all-link:hover {
    color: var(--primary-700);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

.review-card {
    background: var(--neutral-100);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all 0.25s ease-out;
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.review-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.review-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.review-badge {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    background: var(--success);
    color: var(--neutral-100);
    padding: 4px var(--space-xs);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.review-badge--good {
    background: var(--primary-500);
}

.review-badge--warning {
    background: var(--warning);
    color: var(--neutral-900);
}

.review-content {
    padding: var(--space-lg);
}

.review-category {
    display: inline-block;
    background: var(--primary-100);
    color: var(--primary-500);
    padding: 4px var(--space-xs);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.review-title {
    color: var(--neutral-900);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

.review-excerpt {
    color: var(--neutral-400);
    margin-bottom: var(--space-md);
    font-size: 16px;
}

.review-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    padding-top: var(--space-sm);
    border-top: 1px solid #eee;
}

.rating {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.stars {
    color: #FFD700;
}

.rating-text {
    font-size: 14px;
    color: var(--neutral-400);
}

.read-time {
    font-size: 14px;
    color: var(--neutral-400);
}

/* =============================================
   BOTONES
   ============================================= */

.btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    border: none;
    line-height: 1;
}

.btn-primary {
    background: var(--primary-500);
    color: var(--neutral-100);
    width: 100%;
}

.btn-primary:hover {
    background: var(--primary-700);
    transform: scale(0.98);
}

.btn-outline {
    background: transparent;
    color: var(--primary-500);
    border: 2px solid var(--primary-500);
}

.btn-outline:hover {
    background: var(--primary-500);
    color: var(--neutral-100);
}

/* =============================================
   NEWSLETTER
   ============================================= */

.newsletter {
    background: var(--primary-100);
    padding: var(--space-xxl) 0;
}

.newsletter-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.newsletter-title {
    color: var(--neutral-900);
    margin-bottom: var(--space-sm);
}

.newsletter-subtitle {
    color: var(--neutral-400);
    font-size: 18px;
}

.newsletter-form .form-group {
    display: flex;
    gap: var(--space-sm);
}

.form-input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s ease;
}

.form-input:focus {
    border-color: var(--primary-500);
}

.newsletter-disclaimer {
    font-size: 12px;
    color: var(--neutral-400);
    margin-top: var(--space-xs);
    margin-bottom: 0;
}

/* =============================================
   SOBRE MÍ
   ============================================= */

.about {
    padding: var(--space-xxl) 0;
    background: var(--neutral-100);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-description {
    font-size: 18px;
    color: var(--neutral-400);
    margin-bottom: var(--space-md);
}

.about-stats {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

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

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

.about-image img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-100);
}

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

.footer {
    background: var(--neutral-900);
    color: var(--neutral-100);
    padding: var(--space-xxl) 0 var(--space-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-brand {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 20px;
    margin-bottom: var(--space-md);
}

.footer-description {
    color: var(--neutral-400);
    margin-bottom: var(--space-md);
}

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-500);
    color: var(--neutral-100);
    border-radius: 50%;
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.social-link:hover {
    background: var(--primary-700);
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--neutral-100);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-xs);
}

.footer-links a {
    color: var(--neutral-400);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--primary-500);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
    color: var(--neutral-400);
}

.footer-bottom {
    border-top: 1px solid var(--neutral-400);
    padding-top: var(--space-md);
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-md);
    align-items: center;
}

.footer-disclaimer {
    font-size: 12px;
    color: var(--neutral-400);
}

.footer-copyright {
    text-align: right;
    font-size: 14px;
    color: var(--neutral-400);
}

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

/* Tablet */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    .hero-stats {
        gap: var(--space-md);
    }
    
    .newsletter-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-md);
    }
}

/* Mobile */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
    
    h1, .h1 {
        font-size: 36px;
    }
    
    h2, .h2 {
        font-size: 28px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: var(--space-xl) 0;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .search-box {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .search-input {
        width: 100%;
    }
    
    .search-btn {
        width: 100%;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .newsletter-form .form-group {
        flex-direction: column;
    }
    
    .about-stats {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-copyright {
        text-align: center;
    }
}

/* =============================================
   ANIMACIONES Y UTILIDADES
   ============================================= */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Estados de carga */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Utilidades */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

/* Estados de hover para enlaces */
a {
    transition: color 0.2s ease;
}

/* Mejoras de accesibilidad */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states para accesibilidad */
button:focus,
input:focus,
a:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .nav-toggle,
    .newsletter,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
}