/* ==========================================
   Custom Properties & Design Tokens
   ========================================== */
:root {
    /* Colores - Modo Claro */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #0f172a;
    --color-accent: #06b6d4;
    
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-card: #ffffff;
    --color-text: #334155;
    --color-text-heading: #0f172a;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-input-bg: #ffffff;
    --color-input-border: #cbd5e1;
    --color-input-focus: #2563eb;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-overlay: rgba(255, 255, 255, 0.8);
    
    /* Espaciado */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Tipografía */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Bordes */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Modo Oscuro */
[data-theme="dark"] {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-primary-light: #2563eb;
    --color-secondary: #e2e8f0;
    --color-accent: #22d3ee;
    
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-bg-card: #1e293b;
    --color-text: #e2e8f0;
    --color-text-heading: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --color-input-bg: #1e293b;
    --color-input-border: #475569;
    --color-input-focus: #3b82f6;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(15, 23, 42, 0.8);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

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

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

a:hover {
    color: var(--color-primary-hover);
}

/* ==========================================
   Skip Link (Accesibilidad)
   ========================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--space-xs) var(--space-md);
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

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

/* ==========================================
   Header
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: var(--color-overlay);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-base);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    min-height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text-heading);
    font-size: var(--text-lg);
    font-weight: 500;
    text-decoration: none;
}

.logo:hover {
    color: var(--color-primary);
}

.logo-text strong {
    font-weight: 700;
}

/* Navegación */
.nav {
    display: flex;
    align-items: center;
}

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

.nav-link {
    color: var(--color-text);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1000;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.nav.active .nav-toggle span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav.active .nav-toggle span:nth-child(2) {
    opacity: 0;
}

.nav.active .nav-toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xs);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--color-bg-alt);
    border-color: var(--color-primary);
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: block;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    padding: calc(var(--space-3xl) + 64px) 0 var(--space-3xl);
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: 800;
    color: var(--color-text-heading);
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--text-xl);
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-submit {
    width: 100%;
    justify-content: center;
    padding: var(--space-md);
    font-size: var(--text-lg);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loader {
    display: flex;
    align-items: center;
}

.spinner {
    animation: spin 1s linear infinite;
    transform-origin: center;
}

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

/* ==========================================
   Sections
   ========================================== */
.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-text-heading);
    text-align: center;
    margin-bottom: var(--space-sm);
}

.section-description {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--text-lg);
    margin-bottom: var(--space-2xl);
}

/* ==========================================
   Services Section
   ========================================== */
.services {
    padding: var(--space-3xl) 0;
    background-color: var(--color-bg-alt);
}

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

.service-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

.service-icon {
    margin-bottom: var(--space-md);
}

.service-card h3 {
    font-size: var(--text-xl);
    color: var(--color-text-heading);
    margin-bottom: var(--space-sm);
}

.service-card p {
    color: var(--color-text-muted);
}

/* ==========================================
   About Section
   ========================================== */
.about {
    padding: var(--space-3xl) 0;
}

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

.about-text h2 {
    text-align: left;
}

.about-text p {
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.about-features {
    list-style: none;
    display: grid;
    gap: var(--space-sm);
}

.about-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
}

/* ==========================================
   Contact Section
   ========================================== */
.contact {
    padding: var(--space-3xl) 0;
    background-color: var(--color-bg-alt);
}

.contact-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-2xl);
}

.contact-form {
    display: grid;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-heading);
}

.form-input {
    padding: var(--space-sm);
    border: 2px solid var(--color-input-border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text);
    background-color: var(--color-input-bg);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-input-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error {
    border-color: #ef4444;
}

.form-error {
    font-size: var(--text-xs);
    color: #ef4444;
    display: none;
}

.form-error.visible {
    display: block;
}

textarea.form-input {
    resize: vertical;
    min-height: 100px;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.form-message {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 500;
}

.form-message.success {
    background-color: #10b981;
    color: white;
}

.form-message.error {
    background-color: #ef4444;
    color: white;
}

/* Contact Info */
.contact-info {
    display: grid;
    gap: var(--space-md);
}

.info-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.info-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.info-card svg {
    margin-bottom: var(--space-xs);
    color: var(--color-primary);
}

.info-card h4 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: var(--space-xs);
}

.info-card a,
.info-card p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* Social Links */
.social-links {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    transition: all var(--transition-base);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background-color: var(--color-secondary);
    color: white;
    padding: var(--space-2xl) 0 var(--space-md);
}

[data-theme="dark"] .footer {
    background-color: var(--color-bg-alt);
}

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

.footer-brand p {
    margin-top: var(--space-sm);
    opacity: 0.8;
    font-size: var(--text-sm);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: white;
    font-size: var(--text-lg);
    font-weight: 500;
}

.footer-links h4,
.footer-services h4,
.footer-contact h4 {
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.footer-links ul,
.footer-services ul {
    list-style: none;
    display: grid;
    gap: var(--space-xs);
}

.footer-links a,
.footer-services a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-services a:hover {
    color: white;
}

.footer-contact a,
.footer-contact p {
    display: block;
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-xs);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    opacity: 0.7;
}

.footer-legal {
    display: flex;
    gap: var(--space-md);
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-legal a:hover {
    color: white;
}

/* ==========================================
   WhatsApp Button
   ========================================== */
.whatsapp-button {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 60px;
    height: 60px;
    background: #25D366;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-xl);
    z-index: 50;
    transition: all var(--transition-base);
    animation: pulse 2s infinite;
}

.whatsapp-button:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 30px rgba(37, 211, 102, 0.5);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
    }
    70% {
        box-shadow: 0 0 0 15px rgba(37, 211, 102, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(37, 211, 102, 0);
    }
}

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

/* Tablets */
@media (max-width: 1024px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
    }
    
    .hero-stats {
        gap: var(--space-lg);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* Móviles */
@media (max-width: 768px) {
    :root {
        --text-5xl: 2rem;
        --text-4xl: 1.75rem;
        --text-3xl: 1.5rem;
    }
    
    .nav-list {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        z-index: 999;
    }
    
    .nav.active .nav-list {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-link {
        font-size: var(--text-xl);
    }
    
    .hero {
        padding: calc(var(--space-2xl) + 64px) 0 var(--space-2xl);
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .image-placeholder {
        height: 250px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .whatsapp-button {
        width: 50px;
        height: 50px;
        bottom: var(--space-md);
        right: var(--space-md);
    }
}

/* Móviles pequeños */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    :root {
        --text-5xl: 1.75rem;
        --text-4xl: 1.5rem;
    }
    
    .hero-stats {
        gap: var(--space-md);
    }
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.service-card {
    animation: fadeInUp 0.6s ease-out;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .whatsapp-button,
    .theme-toggle,
    .nav-toggle {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    a {
        text-decoration: underline;
    }
}