/* =============================================
   AI ENERGÍA IBÉRICA — Crónica de la IA en la Energía de España
   Main Stylesheet
   ============================================= */

/* === FONTS === */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Noto+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --color-blue-dark: #001F3F;
    --color-blue-bright: #0288D1;
    --color-green-accent: #00E676;
    --color-gold-accent: #FFD600;
    --color-dark-gray: #212121;
    --color-white: #FFFFFF;
    --color-light-gray: #B0BEC5;
    --color-overlay: rgba(0, 31, 63, 0.95);
    
    /* Gradient */
    --gradient-primary: linear-gradient(135deg, var(--color-blue-dark) 0%, var(--color-blue-bright) 100%);
    --gradient-hero: linear-gradient(180deg, rgba(0, 31, 63, 0.9) 0%, rgba(2, 136, 209, 0.85) 100%);
    --gradient-card: linear-gradient(145deg, rgba(0, 31, 63, 0.8), rgba(2, 136, 209, 0.4));
    
    /* Typography */
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Noto Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Font Sizes */
    --font-size-xl: 48px;
    --font-size-lg: 36px;
    --font-size-md: 24px;
    --font-size-base: 18px;
    --font-size-sm: 14px;
    --font-size-xs: 12px;
    
    /* Line Height */
    --line-height: 1.65;
    
    /* Container Widths */
    --width-jumbo: 100vw;
    --width-wide: 1400px;
    --width-medium: 1000px;
    --width-compact: 720px;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-xxl: 120px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 230, 118, 0.3);
    --shadow-glow-gold: 0 0 20px rgba(255, 214, 0, 0.3);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-white);
    background: var(--color-dark-gray);
    overflow-x: hidden;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.5px;
}

h1 {
    font-size: var(--font-size-xl);
    font-weight: 900;
    text-transform: uppercase;
    background: linear-gradient(90deg, var(--color-green-accent), var(--color-blue-bright));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: var(--font-size-lg);
    color: var(--color-green-accent);
}

h3 {
    font-size: var(--font-size-md);
    color: var(--color-gold-accent);
}

h4, h5, h6 {
    font-size: var(--font-size-base);
    color: var(--color-light-gray);
}

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

a {
    color: var(--color-green-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-gold-accent);
    text-decoration: underline;
}

strong {
    font-weight: 600;
    color: var(--color-green-accent);
}

em {
    font-style: italic;
    color: var(--color-gold-accent);
}

/* === LAYOUT CONTAINERS === */
.container-jumbo {
    width: 100%;
    max-width: var(--width-jumbo);
    margin: 0 auto;
}

.container-wide {
    width: 100%;
    max-width: var(--width-wide);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-medium {
    width: 100%;
    max-width: var(--width-medium);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-compact {
    width: 100%;
    max-width: var(--width-compact);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === HEADER & NAVIGATION === */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--gradient-primary);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-medium);
}

.site-header.hidden {
    transform: translateY(-100%);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: var(--width-wide);
    margin: 0 auto;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.site-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--color-green-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    color: var(--color-blue-dark);
    box-shadow: var(--shadow-glow);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.main-nav a {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--color-green-accent);
    color: var(--color-blue-dark);
    text-decoration: none;
    box-shadow: var(--shadow-glow);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: 2px solid var(--color-green-accent);
    color: var(--color-green-accent);
    font-size: 24px;
    padding: var(--spacing-xs);
    cursor: pointer;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background: var(--color-green-accent);
    color: var(--color-blue-dark);
}

/* === HERO SECTION === */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.1;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, var(--color-green-accent) 2px, var(--color-green-accent) 3px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, var(--color-green-accent) 2px, var(--color-green-accent) 3px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: var(--width-medium);
    padding: var(--spacing-xl) var(--spacing-md);
}

.hero-title {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: var(--font-size-md);
    color: var(--color-light-gray);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-cta {
    display: inline-flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s both;
}

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

/* === BUTTONS === */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-medium);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-green-accent);
    color: var(--color-blue-dark);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: var(--color-gold-accent);
    box-shadow: var(--shadow-glow-gold);
    transform: translateY(-2px);
    text-decoration: none;
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-green-accent);
}

.btn-secondary:hover {
    background: var(--color-green-accent);
    color: var(--color-blue-dark);
    text-decoration: none;
}

/* === SECTIONS === */
.section {
    padding: var(--spacing-xxl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-label {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-gold-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-xs);
}

.section-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.section-description {
    font-size: var(--font-size-base);
    color: var(--color-light-gray);
    max-width: var(--width-compact);
    margin: 0 auto;
}

/* === CARDS === */
.card {
    background: var(--gradient-card);
    border: 1px solid rgba(0, 230, 118, 0.2);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all var(--transition-medium);
    height: 100%;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--color-green-accent);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--color-green-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--color-blue-dark);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-glow);
}

.card-title {
    font-size: var(--font-size-md);
    color: var(--color-green-accent);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    color: var(--color-light-gray);
    margin-bottom: var(--spacing-md);
}

.card-meta {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-gold-accent);
    margin-top: var(--spacing-sm);
}

/* === GRID LAYOUTS === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--spacing-lg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
}

/* === TIMELINE === */
.timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-green-accent), var(--color-blue-bright));
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-content {
    flex: 1;
    background: var(--gradient-card);
    border: 1px solid rgba(0, 230, 118, 0.2);
    border-radius: 8px;
    padding: var(--spacing-lg);
    position: relative;
}

.timeline-marker {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: var(--color-green-accent);
    border: 4px solid var(--color-blue-dark);
    border-radius: 50%;
    box-shadow: var(--shadow-glow);
    z-index: 2;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-gold-accent);
    margin-bottom: var(--spacing-xs);
}

/* === MODAL === */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    overflow-y: auto;
    animation: fadeIn var(--transition-medium);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--gradient-card);
    border: 2px solid var(--color-green-accent);
    border-radius: 8px;
    max-width: var(--width-medium);
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--spacing-lg);
    position: relative;
    animation: slideIn var(--transition-medium);
    margin: var(--spacing-lg);
}

.modal-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--color-green-accent);
    color: var(--color-blue-dark);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-gold-accent);
    transform: rotate(90deg);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* === FORMS === */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-green-accent);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-sm);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    color: var(--color-white);
    background: rgba(0, 31, 63, 0.5);
    border: 1px solid rgba(0, 230, 118, 0.3);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-green-accent);
    box-shadow: var(--shadow-glow);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
}

.form-checkbox input[type="checkbox"] {
    margin-top: 4px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-checkbox label {
    font-size: var(--font-size-sm);
    color: var(--color-light-gray);
    cursor: pointer;
}

/* === ACCORDION === */
.accordion-item {
    background: var(--gradient-card);
    border: 1px solid rgba(0, 230, 118, 0.2);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.accordion-header:hover {
    background: rgba(0, 230, 118, 0.1);
}

.accordion-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-base);
    color: var(--color-green-accent);
    margin: 0;
}

.accordion-icon {
    font-size: 20px;
    color: var(--color-gold-accent);
    transition: transform var(--transition-fast);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-medium);
}

.accordion-item.active .accordion-content {
    max-height: 1000px;
}

.accordion-body {
    padding: var(--spacing-md);
    color: var(--color-light-gray);
    border-top: 1px solid rgba(0, 230, 118, 0.2);
}

/* === FILTERS === */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    background: transparent;
    color: var(--color-light-gray);
    border: 1px solid rgba(0, 230, 118, 0.3);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-green-accent);
    color: var(--color-blue-dark);
    border-color: var(--color-green-accent);
    box-shadow: var(--shadow-glow);
}

/* === FOOTER === */
.site-footer {
    background: var(--gradient-primary);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    max-width: var(--width-wide);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-sm);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--color-light-gray);
    font-size: var(--font-size-sm);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-width: var(--width-wide);
    margin: 0 auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-light-gray);
    margin-bottom: var(--spacing-xs);
}

/* === UTILITY CLASSES === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* === RESPONSIVE === */
@media (max-width: 1024px) {
    :root {
        --font-size-xl: 40px;
        --font-size-lg: 32px;
        --font-size-md: 20px;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item,
    .timeline-item:nth-child(even) {
        flex-direction: row;
        padding-left: 60px;
    }
    
    .timeline-marker {
        left: 30px;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-blue-dark);
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-xl: 32px;
        --font-size-lg: 24px;
        --font-size-base: 16px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .container-wide,
    .container-medium,
    .container-compact {
        padding: 0 var(--spacing-sm);
    }
}

/* === LOADING ANIMATIONS === */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 230, 118, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-green-accent);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* === ENERGY VISUALIZATION EFFECTS === */
.energy-pulse {
    position: relative;
    animation: energyPulse 2s ease-in-out infinite;
}

@keyframes energyPulse {
    0%, 100% {
        box-shadow: 0 0 10px var(--color-green-accent);
    }
    50% {
        box-shadow: 0 0 30px var(--color-green-accent), 0 0 50px var(--color-green-accent);
    }
}

.hologram-effect {
    position: relative;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(0, 230, 118, 0.1) 50%,
        transparent 70%
    );
    background-size: 200% 200%;
    animation: hologramScan 3s linear infinite;
}

@keyframes hologramScan {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

/* === PRINT STYLES === */
@media print {
    .site-header,
    .site-footer,
    .mobile-menu-toggle,
    .modal,
    .btn,
    .form-section {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .section {
        page-break-inside: avoid;
    }
}