/* =========================================
   MECÁNICA HOY - TECHNICAL TRUST DESIGN SYSTEM
   ========================================= */

:root {
    /* Color Palette */
    --color-bg-body: #0f172a;
    /* Dark Blue/Slate Background */
    --color-bg-card: #1e293b;
    /* Lighter Blue/Slate for Cards */
    --color-text-main: #f8fafc;
    /* Off-white text */
    --color-text-muted: #94a3b8;
    /* Muted text */
    --color-accent: #f97316;
    /* Vibrant Orange for CTAs */
    --color-primary: #3b82f6;
    /* Blue for links/tech elements */
    --color-border: #334155;
    /* Subtle borders */

    /* Typography */
    --font-heading: 'Roboto', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing & Layout */
    --container-width: 1200px;
    --spacer-sm: 1rem;
    --spacer-md: 2rem;
    --spacer-lg: 4rem;
}

/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    font-family: var(--font-body);
    line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--color-text-main);
    margin-bottom: 0.5em;
    font-weight: 700;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

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

/* =========================================
   HEADER
   ========================================= */
.site-header {
    background-color: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-text-main);
    text-transform: uppercase;
    letter-spacing: -1px;
}

.logo span {
    color: var(--color-accent);
}

.main-nav ul {
    display: flex;
    gap: 1.5rem;
}

.main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

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

/* =========================================
   HERO SECTION
   ========================================= */
.hero {
    padding: 6rem 0;
    background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.8)),
        url('https://images.unsplash.com/photo-1487754180451-c456f719a1fc?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
    background-size: cover;
    background-position: center;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.btn-cta {
    display: inline-block;
    background-color: var(--color-accent);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    font-weight: 600;
    transition: transform 0.2s, background-color 0.2s;
}

.btn-cta:hover {
    background-color: #ea580c;
    transform: translateY(-2px);
}

/* =========================================
   SYSTEMS GRID (Categorías Principales)
   ========================================= */
.systems-section {
    padding: var(--spacer-lg) 0;
    background-color: var(--color-bg-body);
}

.systems-section h2,
.latest-articles h2,
.site-map-section h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.systems-section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--color-accent);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

.systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.system-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 2rem;
    transition: transform 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
}

.system-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
}

.system-card h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.system-card p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.system-card a {
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
}

.system-card a::after {
    content: '→';
    margin-left: 5px;
    transition: margin-left 0.2s;
}

.system-card a:hover::after {
    margin-left: 10px;
}

/* =========================================
   TECHNICAL SITEMAP (Jerarquía)
   ========================================= */
.site-map-section {
    padding: var(--spacer-lg) 0;
    background-color: #0b1120;
    /* Slightly darker */
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.sitemap-grid {
    column-count: 3;
    column-gap: 2rem;
}

.category-block {
    break-inside: avoid;
    margin-bottom: 2rem;
    background: rgba(30, 41, 59, 0.5);
    padding: 1.5rem;
    border-radius: 6px;
    border-left: 3px solid var(--color-accent);
}

.category-block h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--color-text-main);
}

.subcategory-list li {
    margin-bottom: 0.5rem;
}

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

.subcategory-list a:hover {
    color: var(--color-primary);
    padding-left: 5px;
}

@media (max-width: 768px) {
    .sitemap-grid {
        column-count: 1;
    }
}

/* =========================================
   LATEST ARTICLES
   ========================================= */
.latest-articles {
    padding: var(--spacer-lg) 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.article-card {
    background-color: var(--color-bg-card);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-3px);
}

.article-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.25rem;
}

.article-card p {
    padding: 0 1.5rem 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.article-card a {
    display: block;
    padding: 1rem 1.5rem;
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
    font-weight: 600;
    text-align: right;
}

.article-card a:hover {
    background-color: rgba(59, 130, 246, 0.2);
}

/* =========================================
   FOOTER
   ========================================= */
.site-footer {
    background-color: #020617;
    padding: 3rem 0;
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

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

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

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