/* =============================================
   HELIURO - Solar & Green Energy Systems
   Análisis de Infraestructura y Medio Ambiente
   ============================================= */

/* ===== ROOT VARIABLES ===== */
:root {
    /* Colors */
    --color-primary: #0A1B28;        /* Azul profundo - estructura principal */
    --color-background: #E6EBEF;     /* Gris suave - fondos */
    --color-accent: #2F8F4E;         /* Verde energético - acentos */
    --color-technical: #5D8B9A;      /* Azul técnico - gráficos */
    --color-white: #FFFFFF;
    --color-text: #1A2B3C;
    --color-text-light: #4A5A6A;
    --color-border: #C5D0D8;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-technical: 'Roboto Mono', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* Transitions */
    --transition-standard: all 0.3s ease;
    --transition-smooth: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-standard);
}

ul {
    list-style: none;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

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

.technical-text {
    font-family: var(--font-technical);
    font-size: 0.9rem;
    color: var(--color-technical);
}

/* ===== LAYOUT UTILITIES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-dark {
    background: linear-gradient(135deg, var(--color-primary) 0%, #142838 100%);
    color: var(--color-white);
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
    color: var(--color-white);
}

.section-dark p {
    color: rgba(255, 255, 255, 0.85);
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

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

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    background-color: var(--color-primary);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

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

.logo-text {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.5px;
}

.logo-subtitle {
    display: block;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-accent);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: -4px;
}

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

.nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition-standard);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background-color: rgba(93, 139, 154, 0.2);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #142838 50%, #1F3A4A 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(47, 143, 78, 0.05) 50%, transparent 70%),
        linear-gradient(-45deg, transparent 30%, rgba(93, 139, 154, 0.05) 50%, transparent 70%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.hero-description {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-standard);
    border: 2px solid transparent;
    text-align: center;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background-color: #268B42;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(47, 143, 78, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-technical);
}

.btn-secondary:hover {
    background-color: var(--color-technical);
    transform: translateY(-2px);
}

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ===== CARDS ===== */
.card {
    background-color: var(--color-white);
    border-radius: 8px;
    padding: var(--spacing-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: var(--transition-standard);
    border: 1px solid var(--color-border);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-technical) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    font-size: 1.8rem;
    color: var(--color-white);
}

.card h3 {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-xs);
}

.card p {
    font-size: 0.95rem;
    line-height: 1.6;
}

.card-technical {
    background: linear-gradient(135deg, #F8FAFB 0%, var(--color-background) 100%);
    border-left: 4px solid var(--color-technical);
}

/* ===== FEATURE BOXES ===== */
.feature-box {
    background: var(--color-white);
    border-radius: 10px;
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.feature-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-technical) 100%);
}

/* Feature box dentro de secciones oscuras */
.section-dark .feature-box {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.section-dark .feature-box h3,
.section-dark .feature-box h4 {
    color: var(--color-white);
}

.section-dark .feature-box p,
.section-dark .feature-box strong {
    color: rgba(255, 255, 255, 0.9);
}

.section-dark .feature-item {
    background-color: rgba(255, 255, 255, 0.03);
}

.section-dark .feature-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.feature-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.feature-icon {
    font-size: 2rem;
    color: var(--color-technical);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background-color: var(--color-background);
    border-radius: 6px;
    transition: var(--transition-standard);
}

.feature-item:hover {
    background-color: #DCE4E9;
    transform: translateX(4px);
}

.feature-item-icon {
    color: var(--color-accent);
    margin-top: 2px;
    flex-shrink: 0;
}

/* ===== STATISTICS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition-standard);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== TECHNICAL DIAGRAMS ===== */
.diagram-container {
    background: var(--color-white);
    border-radius: 8px;
    padding: var(--spacing-md);
    border: 2px solid var(--color-technical);
    margin: var(--spacing-md) 0;
}

.diagram-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.diagram-item {
    background: var(--color-background);
    padding: var(--spacing-sm);
    border-radius: 6px;
    text-align: center;
    border-left: 3px solid var(--color-accent);
}

.diagram-value {
    font-family: var(--font-technical);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-technical);
}

.diagram-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
}

/* Diagram items dentro de secciones oscuras */
.section-dark .diagram-item {
    background: rgba(255, 255, 255, 0.05);
    border-left-color: var(--color-accent);
}

.section-dark .diagram-value {
    color: var(--color-accent);
}

.section-dark .diagram-label {
    color: rgba(255, 255, 255, 0.9) !important;
}

/* ===== INSIGHTS / ARTICLES ===== */
.article-card {
    background: var(--color-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: var(--transition-standard);
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.article-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-technical) 0%, var(--color-accent) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--color-white);
}

.article-content {
    padding: var(--spacing-md);
}

.article-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.article-tag {
    background-color: var(--color-background);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--color-technical);
    font-weight: 500;
}

.article-title {
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.article-excerpt {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.read-more {
    color: var(--color-technical);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-standard);
}

.read-more:hover {
    color: var(--color-accent);
    gap: 0.75rem;
}

/* ===== CONTACT FORM ===== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.contact-form {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--color-border);
    border-radius: 6px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-standard);
    background-color: var(--color-background);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-technical);
    background-color: var(--color-white);
}

.form-textarea {
    resize: vertical;
    min-height: 150px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-card {
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.info-card h4 {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-technical);
    margin-bottom: var(--spacing-xs);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--color-primary);
    color: rgba(255, 255, 255, 0.85);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-section h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-standard);
    padding: 0.25rem 0;
}

.footer-link:hover {
    color: var(--color-accent);
    padding-left: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* ===== BREADCRUMBS ===== */
.breadcrumbs {
    background-color: var(--color-background);
    padding: var(--spacing-sm) 0;
}

.breadcrumb-list {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    margin-left: var(--spacing-xs);
    color: var(--color-border);
}

.breadcrumb-item a:hover {
    color: var(--color-technical);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-primary);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-md);
        transition: left 0.3s ease;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: var(--spacing-lg) 0;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

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

.text-accent {
    color: var(--color-accent);
}

.text-technical {
    color: var(--color-technical);
}

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

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

.fade-in {
    animation: fadeIn 0.8s ease-in;
}

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

/* ===== ACCESSIBILITY ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===== FAQ SECTION ===== */
.faq-item {
    background: var(--color-white);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--color-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition-standard);
}

.faq-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transform: translateX(4px);
}

.section-dark .faq-item {
    background: rgba(255, 255, 255, 0.05);
    border-left-color: var(--color-accent);
}

.faq-question {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.faq-question i {
    color: var(--color-accent);
    font-size: 1.5rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.faq-question h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.section-dark .faq-question h3 {
    color: var(--color-white);
}

.faq-answer {
    padding-left: 2.5rem;
}

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

.faq-answer ul {
    list-style: disc;
    margin-left: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.faq-answer li {
    padding: 0.25rem 0;
    color: var(--color-text-light);
}

.section-dark .faq-answer p,
.section-dark .faq-answer li {
    color: rgba(255, 255, 255, 0.85);
}

/* ===== COOKIE BANNER ===== */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-md);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-banner-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.cookie-banner-text {
    flex: 1;
    min-width: 300px;
}

.cookie-banner-text h4 {
    color: var(--color-white);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.cookie-banner-text p {
    margin: 0;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
}

.cookie-banner-text a {
    color: var(--color-accent);
    text-decoration: underline;
}

.cookie-banner-text a:hover {
    color: #268B42;
}

.cookie-banner-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.cookie-btn {
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-standard);
    border: none;
    font-size: 0.95rem;
}

.cookie-btn-accept {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.cookie-btn-accept:hover {
    background-color: #268B42;
    transform: translateY(-2px);
}

.cookie-btn-decline {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cookie-btn-decline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .cookie-banner-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .cookie-banner-buttons {
        width: 100%;
    }
    
    .cookie-btn {
        flex: 1;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .header,
    .footer,
    .nav-toggle,
    .btn,
    .cookie-banner {
        display: none;
    }
    
    body {
        background-color: white;
        color: black;
    }
}