/*
 * Estilos principales - Unai3D
 * Estética Bauhaus minimalista - Escala de grises
 * Tipografía: Inter
 */

/* ==========================================================================
   Variables CSS - Tema claro por defecto
   ========================================================================== */

:root {
    /* Colores - Modo Claro */
    --color-background: #FFFFFF;
    --color-surface: #FAFAFA;
    --color-text: #1A1A1A;
    --color-text-secondary: #4A4A4A;
    --color-text-muted: #8A8A8A;
    --color-border: #E5E5E5;
    --color-border-strong: #CCCCCC;

    /* Tipografía */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Tamaños de fuente */
    --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: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;

    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --content-width: 720px;
    --header-height: 72px;

    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ==========================================================================
   Tema Oscuro
   ========================================================================== */

[data-theme="dark"] {
    --color-background: #0A0A0A;
    --color-surface: #141414;
    --color-text: #F5F5F5;
    --color-text-secondary: #B0B0B0;
    --color-text-muted: #707070;
    --color-border: #2A2A2A;
    --color-border-strong: #3A3A3A;
}

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

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--text-5xl);
    font-weight: 700;
}

h2 {
    font-size: var(--text-3xl);
}

h3 {
    font-size: var(--text-2xl);
}

h4 {
    font-size: var(--text-xl);
}

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

a {
    color: var(--color-text);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity var(--transition-fast);
}

a:hover {
    opacity: 0.7;
}

/* ==========================================================================
   Layout
   ========================================================================== */

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

.content-narrow {
    max-width: var(--content-width);
}

/* ==========================================================================
   Header y Navegación
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
    filter: invert(1); /* Invertir para tema claro (negro sobre blanco) */
    transition: filter var(--transition-base);
}

[data-theme="dark"] .logo-img {
    filter: invert(0); /* Original para tema oscuro (blanco sobre negro) */
}

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

.nav-link {
    font-size: var(--text-sm);
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
    opacity: 1;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    cursor: pointer;
    color: var(--color-text);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--color-text);
    background-color: var(--color-surface);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   Main Content
   ========================================================================== */

main {
    padding-top: var(--header-height);
}

section {
    padding: var(--spacing-3xl) 0;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: calc(80vh - var(--header-height));
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.4fr 0.6fr;
    gap: var(--spacing-xl);
    align-items: center;
    width: 100%;
}

.hero-text {
    max-width: 600px;
}

.hero-eyebrow {
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

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

/* Hero 3D Model */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-3d-model {
    width: 100%;
    aspect-ratio: 1;
    background-color: transparent;
    --poster-color: transparent;
}

/* Ocultar controles internos de model-viewer */
.hero-3d-model::part(default-progress-bar) {
    display: none;
}

.hero-3d-model::part(default-ar-button) {
    display: none;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    opacity: 0.85;
}

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

.btn-secondary:hover {
    border-color: var(--color-text);
    opacity: 1;
}

.btn-full {
    width: 100%;
    text-align: center;
}

/* ==========================================================================
   Credentials Section
   ========================================================================== */

.credentials {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    text-align: center;
}

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

.credential-number {
    font-size: var(--text-3xl);
    font-weight: 700;
    line-height: 1;
}

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

/* ==========================================================================
   Certifications Section
   ========================================================================== */

.certifications {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-surface);
    transition: background-color var(--transition-base);
}

.certifications h2 {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.certifications-grid {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.cert-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.cert-badge img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    filter: grayscale(100%);
    transition: filter var(--transition-fast);
}

.cert-badge:hover img {
    filter: grayscale(0%);
}

.cert-badge span {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.certifications-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.certifications-list li {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.certifications-list li strong {
    color: var(--color-text);
}

/* ==========================================================================
   Services Section
   ========================================================================== */

.services {
    padding: var(--spacing-3xl) 0;
}

.services h2 {
    margin-bottom: var(--spacing-xl);
}

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

.service-card {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-fast);
}

.service-card:hover {
    border-color: var(--color-text);
}

.service-card h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    color: var(--color-text-secondary);
    font-size: var(--text-base);
    margin-bottom: 0;
}

/* ==========================================================================
   About Section
   ========================================================================== */

.about {
    background-color: var(--color-surface);
    transition: background-color var(--transition-base);
}

.about h2 {
    margin-bottom: var(--spacing-xl);
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.about-text p {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-text strong {
    color: var(--color-text);
}

.about-experience h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.experience-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.experience-list li {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.experience-list li strong {
    font-size: var(--text-base);
}

.experience-list li span {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact {
    padding: var(--spacing-3xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-info {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-lg));
}

.contact-title {
    margin-bottom: var(--spacing-md);
}

.contact-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.contact-details {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.contact-details p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.contact-details strong {
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Contact Form
   ========================================================================== */

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

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

.form-group label {
    font-size: var(--text-sm);
    font-weight: 500;
}

.form-group .optional {
    font-weight: 400;
    color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-sm);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    color: var(--color-text);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-fast), background-color var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-text);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%234A4A4A' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    padding-right: var(--spacing-xl);
}

[data-theme="dark"] .form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23B0B0B0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
}

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

.form-note {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-align: center;
    margin-top: var(--spacing-sm);
}

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

.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    transition: border-color var(--transition-base);
}

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

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

/* ==========================================================================
   Portfolio Page
   ========================================================================== */

.page-header {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

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

.page-description {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
    max-width: 600px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    padding-bottom: var(--spacing-3xl);
}

.project-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    transition: border-color var(--transition-fast), background-color var(--transition-base);
}

.project-card:hover {
    border-color: var(--color-text);
}

.project-card-title {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-xs);
}

.project-card-category {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.project-card-description {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* ==========================================================================
   Blog Page
   ========================================================================== */

/* Blog Header */
.blog-header {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.blog-header-content {
    max-width: 600px;
}

.blog-eyebrow {
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.blog-name {
    font-size: var(--text-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
}

.blog-tagline {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

/* Blog Section */
.blog-section {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}

/* Skeleton Loader */
.blog-skeleton {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.skeleton-post {
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.skeleton-date,
.skeleton-title,
.skeleton-excerpt {
    background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: 4px;
}

.skeleton-date {
    width: 100px;
    height: 14px;
    margin-bottom: var(--spacing-sm);
}

.skeleton-title {
    width: 80%;
    height: 28px;
    margin-bottom: var(--spacing-sm);
}

.skeleton-excerpt {
    width: 100%;
    height: 16px;
    margin-bottom: var(--spacing-xs);
}

.skeleton-excerpt.short {
    width: 60%;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Blog Posts */
.blog-posts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.blog-post {
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.blog-post:last-child {
    border-bottom: none;
}

.blog-post-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-border);
}

.blog-post-date {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.blog-post-title {
    font-size: var(--text-2xl);
    margin-bottom: var(--spacing-sm);
}

.blog-post-title a {
    text-decoration: none;
}

.blog-post-title a:hover {
    text-decoration: underline;
}

.blog-post-excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.blog-post-link {
    font-size: var(--text-sm);
    font-weight: 500;
}

.blog-loading,
.blog-error {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-muted);
}

/* Blog More Link */
.blog-more {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-xl);
}

/* Substack CTA - Improved */
.substack-cta {
    background-color: var(--color-surface);
    padding: var(--spacing-2xl);
    text-align: center;
    border: 1px solid var(--color-border);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.substack-cta-icon {
    margin-bottom: var(--spacing-md);
}

.substack-cta-icon svg {
    width: 48px;
    height: 48px;
    color: var(--color-text-muted);
}

.substack-cta-title {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-xs);
}

.substack-cta-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-text);
    color: var(--color-background);
    text-decoration: none;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

.btn:hover {
    opacity: 0.8;
}

/* ==========================================================================
   Mobile Navigation
   ========================================================================== */

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-3xl: 1.75rem;
        --spacing-3xl: 4rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .nav-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: flex-start;
        padding-top: var(--spacing-xl);
        gap: var(--spacing-md);
        background-color: var(--color-background);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .nav.active {
        transform: translateX(0);
    }

    .nav-link {
        font-size: var(--text-lg);
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-2xl) 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-visual {
        order: -1; /* Modelo arriba en móvil */
    }

    .hero-3d-model {
        max-width: 200px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        text-align: center;
    }

    .credentials-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .about-experience {
        padding-top: var(--spacing-lg);
        border-top: 1px solid var(--color-border);
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .contact-info {
        position: static;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --text-5xl: 2rem;
        --text-3xl: 1.5rem;
    }
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

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