/* ============================================
   SolarViax - Sistema de Diseño y Estilos
   Tema: Análisis Solar y Ambiental
   ============================================ */

:root {
    /* Paleta de Colores */
    --color-primary: #0A1B28;      /* Azul profundo - estructura principal */
    --color-background: #E6EBEF;    /* Gris claro - fondos */
    --color-accent: #2F8F4E;        /* Verde calentado por el sol - acentos */
    --color-thermal: #5D8B9A;       /* Azul claro térmico - diagramas */
    --color-white: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-light: #555555;
    --color-border: #CBD5E0;
    
    /* Tipografía */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Inter', sans-serif;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Transiciones */
    --transition-base: all 0.3s ease;
}

/* ============================================
   Reset y Base
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* ============================================
   Tipografía
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    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);
    font-size: 1rem;
}

/* ============================================
   Navegación Principal
   ============================================ */

.navbar {
    background: linear-gradient(135deg, var(--color-primary) 0%, #152F3E 100%);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

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

.nav-menu a {
    color: var(--color-white);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.95rem;
    transition: var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: rgba(47, 143, 78, 0.2);
    color: var(--color-accent);
}

.mobile-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%, #1A3544 50%, #2F8F4E 100%);
    padding: 8rem var(--spacing-md) 6rem;
    margin-top: 70px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(93, 139, 154, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(47, 143, 78, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    max-width: 800px;
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ============================================
   Botones
   ============================================ */

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

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

.btn-primary:hover {
    background-color: #267A40;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(47, 143, 78, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
}

/* ============================================
   Container y Grid
   ============================================ */

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

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

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

.section-title h2 {
    margin-bottom: var(--spacing-sm);
}

.section-title p {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

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

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

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--color-white);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: var(--transition-base);
    border: 1px solid var(--color-border);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-thermal));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   Feature Boxes
   ============================================ */

.feature-box {
    background: linear-gradient(135deg, var(--color-white) 0%, #F7FAFC 100%);
    padding: var(--spacing-md);
    border-radius: 12px;
    border-left: 4px solid var(--color-accent);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.feature-box h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.feature-box ul {
    list-style: disc;
    padding-left: var(--spacing-md);
}

.feature-box li {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   Stats y Data Visualization
   ============================================ */

.stats-container {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1A3544 100%);
    padding: var(--spacing-xl) var(--spacing-md);
    border-radius: 16px;
    margin: var(--spacing-lg) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ============================================
   Thermal Gradient Overlays
   ============================================ */

.thermal-overlay {
    position: relative;
    overflow: hidden;
}

.thermal-overlay::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(93, 139, 154, 0.05) 0%, 
        transparent 50%, 
        rgba(47, 143, 78, 0.05) 100%);
    pointer-events: none;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: linear-gradient(135deg, var(--color-primary) 0%, #152F3E 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

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

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

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

/* ============================================
   Forms
   ============================================ */

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

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

.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-base);
    background-color: var(--color-white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(47, 143, 78, 0.1);
}

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

/* ============================================
   Utility Classes
   ============================================ */

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

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

.bg-white {
    background-color: var(--color-white);
}

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

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

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--color-primary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.3);
        padding: var(--spacing-md) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu a {
        padding: 1rem;
        width: 100%;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .hero {
        padding: 5rem var(--spacing-sm) 4rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-md) 0;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .logo {
        font-size: 1.25rem;
    }
}