/* Variables CSS - Modernismo Digital Sofisticado */
:root {
    /* Colores - Neutros sofisticados con mejor contraste */
    --color-primary: #000000;
    --color-secondary: #1a1a1a;
    --color-text: #1f2937;        /* Mejorado para accesibilidad */
    --color-text-light: #4b5563;  /* Mejor contraste */
    --color-text-meta: #6b7280;   /* Más legible */
    --color-surface: #ffffff;
    --color-surface-alt: #f9fafb; /* Más sutil */
    --color-border: #e5e7eb;      /* Más suave */
    --color-accent: #8b5cf6;
    --color-accent-light: rgba(139, 92, 246, 0.1);
    --color-accent-medium: rgba(139, 92, 246, 0.2);
    
    /* Espaciado - Sistema 8px base fluido */
    --space-xs: clamp(0.25rem, 1vw, 0.5rem);   /* 4-8px */
    --space-sm: clamp(0.75rem, 2vw, 1rem);     /* 12-16px */
    --space-md: clamp(1rem, 3vw, 1.5rem);      /* 16-24px */
    --space-lg: clamp(1.5rem, 4vw, 2rem);      /* 24-32px */
    --space-xl: clamp(2rem, 5vw, 3rem);        /* 32-48px */
    --space-2xl: clamp(3rem, 6vw, 4rem);       /* 48-64px */
    --space-3xl: clamp(4rem, 8vw, 6rem);       /* 64-96px */
    --space-4xl: clamp(6rem, 10vw, 8rem);      /* 96-128px */
    
    /* Tipografía - Jerarquía mejorada y fluida */
    --font-size-xs: clamp(0.75rem, 1.5vw, 0.8rem);    /* 12-13px */
    --font-size-sm: clamp(0.875rem, 2vw, 0.9rem);     /* 14px */
    --font-size-base: clamp(1rem, 2.5vw, 1rem);       /* 16px */
    --font-size-lg: clamp(1.125rem, 3vw, 1.2rem);     /* 18-19px */
    --font-size-xl: clamp(1.25rem, 4vw, 1.5rem);      /* 20-24px */
    --font-size-2xl: clamp(1.5rem, 5vw, 2rem);        /* 24-32px */
    --font-size-3xl: clamp(2rem, 6vw, 2.5rem);        /* 32-40px */
    --font-size-4xl: clamp(2.5rem, 8vw, 3rem);        /* 40-48px */
    
    /* Pesos tipográficos */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Alturas de línea */
    --line-height-tight: 1.2;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Espaciado de letras */
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0em;
    --letter-spacing-wide: 0.025em;
    
    /* Sombras mejoradas */
    --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-soft: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-large: 0 20px 25px rgba(0, 0, 0, 0.15), 0 10px 10px rgba(0, 0, 0, 0.04);
    
    /* Otros */
    --border-radius: 6px;
    --border-radius-sm: 4px;
    --border-radius-lg: 8px;
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* ===== RESET CSS MODERNO PARA PIXEL PERFECT ===== */

/* Reset universal con mejores defaults */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Evitar problemas de scroll horizontal */
html {
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

/* Reset de body con mejores defaults */
body {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    vertical-align: baseline;
    line-height: 1;
    min-height: 100vh;
    text-rendering: optimizeSpeed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Reset de elementos de bloque */
article, aside, details, figcaption, figure,
footer, header, hgroup, main, menu, nav, section {
    display: block;
}

/* Reset de listas */
ol, ul {
    list-style: none;
}

/* Reset de quotes */
blockquote, q {
    quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}

/* Reset de tablas */
table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* Reset de elementos de formulario */
input, button, textarea, select {
    font: inherit;
    border: none;
    outline: none;
    background: none;
}

/* Reset de botones */
button {
    cursor: pointer;
    border: none;
    background: none;
    padding: 0;
    font: inherit;
}

/* Reset de enlaces */
a {
    color: inherit;
    text-decoration: none;
    background-color: transparent;
}

/* Reset de imágenes */
img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Reset de tipografía */
h1, h2, h3, h4, h5, h6 {
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
    margin: 0;
}

p {
    margin: 0;
}

/* Eliminar outline en focus (lo personalizaremos después) */
:focus {
    outline: none;
}

/* Reset de elementos inline */
b, strong {
    font-weight: bolder;
}

i, em {
    font-style: italic;
}

/* Reset de elementos de código */
code, kbd, samp, pre {
    font-family: monospace, monospace;
    font-size: 1em;
}

/* Reset de elementos semánticos */
mark {
    background-color: transparent;
    color: inherit;
}

/* Reset de elementos multimedia */
audio, video {
    display: inline-block;
}

audio:not([controls]) {
    display: none;
    height: 0;
}

/* Reset para elementos hidden */
[hidden] {
    display: none !important;
}

/* Mejorar rendimiento de animaciones */
*,
*::before,
*::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
}

@media (prefers-reduced-motion: no-preference) {
    *,
    *::before,
    *::after {
        animation-duration: revert !important;
        animation-iteration-count: revert !important;
        transition-duration: revert !important;
        scroll-behavior: revert !important;
    }
}

/* ===== CONFIGURACIÓN BASE DEL BODY ===== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background: var(--color-surface);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    letter-spacing: var(--letter-spacing-normal);
    /* Compensar fixed header - pixel perfect */
    padding-top: 120px; /* Altura exacta del header + margen */
}

/* Header profesional con scroll behavior */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                background-color 0.3s ease,
                box-shadow 0.3s ease;
    transform: translateY(0);
    max-height: 100px;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: var(--space-sm) 0;
    max-height: 80px;
}

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


.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    width: 100%;
    box-sizing: border-box;
}

.header-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    transition: all 0.3s ease;
}

.header-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    flex: 1;
    min-width: 0; /* Evita overflow */
}

.header-title {
    font-size: var(--font-size-3xl);
    font-weight: 900;
    color: var(--color-primary); /* Fallback para navegadores sin soporte */
    letter-spacing: 0.15em;
    margin: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    line-height: 0.9;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'SF Pro Display', system-ui, sans-serif;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    position: relative;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-primary) 100%);
    background-size: 200% 200%;
    animation: gradientShift 4s ease-in-out infinite;
}

/* Efecto gradiente solo en navegadores compatibles */
@supports (-webkit-background-clip: text) or (background-clip: text) {
    .header-title {
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        color: transparent;
    }
}

.header.scrolled .header-title {
    font-size: var(--font-size-2xl);
}

.header-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0;
    transform: scaleX(0);
    transition: all 0.3s ease;
}

.header-title:hover::after {
    opacity: 1;
    transform: scaleX(1);
}

/* Animación del gradiente del logo */
@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.header.scrolled .header-subtitle {
    display: none;
}

.header-nav {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}


.header-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    font-weight: var(--font-weight-normal);
    margin: 0;
    white-space: nowrap;
    transition: opacity 0.3s ease;
    line-height: var(--line-height-snug);
    letter-spacing: var(--letter-spacing-normal);
}

/* Navegación limpia y profesional */
.nav {
    margin-top: var(--space-sm);
    transition: all 0.3s ease;
}

.header.scrolled .nav {
    margin-top: var(--space-xs);
}

.nav-filters {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
    flex-wrap: nowrap;
}

.nav-filter {
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.nav-filter::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.nav-filter:hover::before {
    left: 100%;
}

.nav-filter:hover {
    background: var(--color-surface-alt);
    border-color: var(--color-text-light);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.nav-filter.active {
    background: var(--color-primary);
    color: var(--color-surface);
    border-color: var(--color-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.nav-filter.active:hover {
    background: var(--color-secondary);
    transform: translateY(-1px);
}

/* Main content */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
    width: 100%;
    box-sizing: border-box;
}

/* Grid sofisticado y fluido */
.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(380px, 100%), 1fr));
    gap: var(--space-xl);
    margin-top: 0;
    width: 100%;
    align-items: start;
}

/* Variantes de grid para diferentes pantallas */
@media (min-width: 1025px) {
    .references-grid {
        grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
        gap: var(--space-xl);
    }
}

@media (min-width: 1200px) {
    .references-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-xl);
    }
}

@media (min-width: 1600px) {
    .references-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-xl);
    }
}

.reference-card {
    background: var(--color-surface);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    border-radius: calc(var(--border-radius) * 2);
    overflow: visible;
}

.reference-card::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 0;
    background: linear-gradient(to top, 
        rgba(255, 255, 255, 0.98) 0%, 
        rgba(255, 255, 255, 0.95) 50%, 
        rgba(255, 255, 255, 0.8) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
    pointer-events: none;
}

.reference-card:hover::before {
    height: 60%;
}

.reference-card .reference-image {
    position: relative;
}

.reference-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.6s ease;
    z-index: 1;
    pointer-events: none;
}

.reference-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: none;
    border-radius: 0;
}

.reference-card:hover::after {
    left: 100%;
}

.reference-image-container {
    display: block;
    overflow: visible;
}

.reference-image {
    width: 100%;
    height: auto;
    object-fit: cover; /* Mantiene proporciones y llena el contenedor */
    object-position: center;
    display: block;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 2;
    transform-origin: center;
    background: var(--color-surface-alt); /* Fondo para imágenes que no llenan completamente */
}

/* Variante para imágenes con aspect ratio diferente */
.reference-image.aspect-ratio-wide {
    aspect-ratio: 1.556; /* Para imágenes más cuadradas como moheim.com */
}

/* Clase para forzar object-fit: cover si se necesita específicamente */
.reference-image.crop {
    object-fit: cover;
    height: clamp(240px, 25vw, 280px);
    aspect-ratio: auto;
}

.reference-card:hover .reference-image {
    transform: scale(1.05);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.reference-content {
    padding: var(--space-lg);
    position: relative;
    z-index: 4;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transition-delay: 0.1s;
    box-sizing: border-box;
}

.reference-card:hover .reference-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0.1s;
}

.reference-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    transition: all 0.3s ease;
    position: relative;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.reference-card:hover .reference-title {
    color: var(--color-accent);
    opacity: 1;
    transform: translateY(0) translateX(4px);
    transition-delay: 0.15s;
}

.reference-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.4s ease;
}

.reference-card:hover .reference-title::after {
    width: 100%;
}

.reference-url {
    color: var(--color-text-meta);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-weight: var(--font-weight-medium);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(10px);
    letter-spacing: var(--letter-spacing-normal);
}

.reference-card:hover .reference-url {
    opacity: 1;
    color: var(--color-accent);
    transform: translateY(0) translateX(2px);
    transition-delay: 0.2s;
}

.reference-description {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(10px);
    font-weight: var(--font-weight-normal);
}

.reference-card:hover .reference-description {
    opacity: 1;
    color: var(--color-text);
    transform: translateY(0);
    transition-delay: 0.25s;
}

.reference-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(10px);
}

.reference-card:hover .reference-tags {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.3s;
}

.reference-tag {
    padding: calc(var(--space-xs) * 0.6) var(--space-xs);
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: calc(var(--font-size-xs) * 0.85);
    color: var(--color-text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
    transform: translateY(0);
}

.reference-tag:nth-child(1) { transition-delay: 0.05s; }
.reference-tag:nth-child(2) { transition-delay: 0.1s; }
.reference-tag:nth-child(3) { transition-delay: 0.15s; }
.reference-tag:nth-child(4) { transition-delay: 0.2s; }

.reference-card:hover .reference-tag {
    transform: translateY(-2px);
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.reference-image-container .reference-link {
    position: absolute !important;
    top: 50% !important;
    right: calc(var(--space-md) - 20px) !important;
    transform: translateY(-50%) scale(0.8) !important;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-primary);
    text-decoration: none;
    border-radius: 50%;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transition-delay: 0.2s;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    z-index: 25;
    opacity: 0;
}

.reference-card:hover .reference-link {
    opacity: 1 !important;
    transform: translateY(-50%) scale(1) !important;
}

.reference-link:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-50%) scale(1.1) !important;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

/* Stats minimalistas */
.stats {
    display: flex;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 300;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

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

/* Menú móvil hamburguesa */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
    transition: all 0.3s ease;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
    transform-origin: center;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translateY(8px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translateY(-8px);
}

/* Overlay para móvil */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Responsive refinado */
@media (max-width: 1024px) {
    /* Header responsive */
    .header {
        padding: var(--space-sm) 0;
        max-height: none;
        min-height: 80px;
    }
    
    .header.scrolled {
        padding: var(--space-xs) 0;
        min-height: 70px;
    }
    
    body {
        padding-top: 80px;
    }
    
    .header-content {
        padding: 0 var(--space-lg);
    }
    
    .main {
        padding: var(--space-xl) var(--space-lg);
    }
    
    .header-main {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-md);
    }
    
    .header-brand {
        flex: 1;
    }
    
    .header-nav {
        position: relative;
        flex-shrink: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-filters {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-lg);
        flex-direction: column;
        gap: var(--space-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1000;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
        max-height: calc(100vh - 80px);
        overflow-y: auto;
    }
    
    .nav-filters.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-filter {
        padding: var(--space-sm) var(--space-md);
        border-radius: var(--border-radius-lg);
        font-size: var(--font-size-base);
        font-weight: 500;
        text-align: center;
        background: var(--color-surface-alt);
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        transform: translateY(20px);
        opacity: 0;
        visibility: hidden;
    }
    
    .nav-filters.active .nav-filter {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-filter:nth-child(1) { transition-delay: 0.1s; }
    .nav-filter:nth-child(2) { transition-delay: 0.15s; }
    .nav-filter:nth-child(3) { transition-delay: 0.2s; }
    .nav-filter:nth-child(4) { transition-delay: 0.25s; }
    .nav-filter:nth-child(5) { transition-delay: 0.3s; }
    .nav-filter:nth-child(6) { transition-delay: 0.35s; }
    
    .nav-filter.active {
        background: var(--color-primary);
        color: white;
        transform: scale(1.02);
    }
    
    
    .header-title {
        font-size: var(--font-size-2xl);
        line-height: 0.95;
        letter-spacing: 0.12em;
    }
    
    .header.scrolled .header-title {
        font-size: var(--font-size-xl);
    }
    
    .header-subtitle {
        font-size: var(--font-size-sm);
        display: none;
    }
    
    .header.scrolled .header-subtitle {
        display: none;
    }
    
    .references-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    /* Eliminar aspect-ratio fijo en móvil para respetar proporciones naturales */
    
    .reference-image-container .reference-link {
        width: 36px !important;
        height: 36px !important;
        font-size: 16px;
        right: calc(var(--space-sm) - 18px) !important;
        z-index: 25;
    }
    
    /* En móvil, mostrar contenido siempre */
    .reference-content {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        transition-delay: 0s;
    }
    
    .reference-title,
    .reference-url,
    .reference-description,
    .reference-tags {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 0s;
    }
    
    .reference-card::before {
        height: 60%;
    }
    
    .reference-link {
        opacity: 1;
        transform: translateY(-50%) scale(1);
        transition-delay: 0s;
    }
    
    .stats {
        flex-direction: column;
        gap: var(--space-md);
        text-align: left;
    }
    
    .stat {
        display: flex;
        align-items: center;
        gap: var(--space-sm);
        text-align: left;
    }
    
    .stat-number {
        margin-bottom: 0;
    }
}

/* Responsive intermedio para tablets */
@media (min-width: 769px) and (max-width: 1024px) {
    .header-content {
        padding: 0 var(--space-lg);
    }
    
    .main {
        padding: var(--space-lg) var(--space-lg);
    }
    
    .nav-filters {
        gap: var(--space-sm);
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-filter {
        font-size: var(--font-size-sm);
        padding: var(--space-xs) var(--space-sm);
    }
    
    .references-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: var(--space-lg);
    }
}

/* Mejoras para pantallas muy pequeñas */
@media (max-width: 320px) {
    .header-content {
        padding: 0 var(--space-sm);
    }
    
    .main {
        padding: var(--space-sm) var(--space-sm);
    }
    
    .header-title {
        font-size: var(--font-size-lg);
    }
    
    .mobile-menu-toggle {
        width: 24px;
        height: 24px;
    }
    
    .nav-filters {
        padding: var(--space-md);
    }
    
    .nav-filter {
        padding: var(--space-sm);
        font-size: var(--font-size-sm);
    }
}

/* Mejoras para landscape en móviles */
@media (max-width: 1024px) and (orientation: landscape) {
    .header {
        min-height: 60px;
    }
    
    body {
        padding-top: 60px;
    }
    
    .nav-filters {
        top: 60px;
        padding: var(--space-md);
    }
    
    .nav-filter {
        padding: var(--space-xs) var(--space-md);
    }
}

/* Estados de loading elegantes */
.loading {
    text-align: center;
    padding: var(--space-4xl);
    color: var(--color-text-light);
}

/* Skeleton Loaders */
.skeleton {
    background: linear-gradient(90deg, 
        var(--color-surface-alt) 25%, 
        #f0f0f0 50%, 
        var(--color-surface-alt) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--border-radius);
}

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

/* Imágenes con proporción fija y responsive */
.reference-image {
    display: block;
    opacity: 1;
    transition: opacity 0.5s ease-out, filter 0.3s ease;
}

.reference-image.loading {
    opacity: 0.7;
}

.image-skeleton {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, 
        #f0f0f0 25%, 
        #e0e0e0 50%, 
        #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

.image-skeleton::before {
    content: '';
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    position: relative;
}

.image-skeleton::after {
    content: '📷';
    position: absolute;
    font-size: 24px;
    opacity: 0.3;
}

.reference-image.loaded {
    display: block;
    animation: fadeInImage 0.5s ease-out;
}

@keyframes fadeInImage {
    from { 
        opacity: 0; 
        transform: scale(1.05);
    }
    to { 
        opacity: 1; 
        transform: scale(1);
    }
}

/* Error state para imágenes */
.image-error {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--color-surface-alt);
    color: var(--color-text-meta);
    border: 2px dashed var(--color-border);
}

.image-error-icon {
    font-size: 32px;
    margin-bottom: var(--space-sm);
    opacity: 0.5;
}

.image-error-text {
    font-size: var(--font-size-sm);
    text-align: center;
}

/* Sistema de Tooltips */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip-content {
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(10px);
    line-height: var(--line-height-snug);
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--color-primary);
}

.tooltip:hover .tooltip-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

/* Variantes de posición para tooltips */
.tooltip-top .tooltip-content {
    bottom: 125%;
    top: auto;
}

.tooltip-bottom .tooltip-content {
    top: 125%;
    bottom: auto;
}

.tooltip-bottom .tooltip-content::after {
    top: -10px;
    border-top-color: transparent;
    border-bottom-color: var(--color-primary);
}

.tooltip-left .tooltip-content {
    right: 125%;
    left: auto;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
}

.tooltip-left .tooltip-content::after {
    top: 50%;
    left: 100%;
    right: auto;
    transform: translateY(-50%);
    border-left-color: var(--color-primary);
    border-top-color: transparent;
}

.tooltip-left:hover .tooltip-content {
    transform: translateY(-50%) translateX(-4px);
}

.tooltip-right .tooltip-content {
    left: 125%;
    right: auto;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
}

.tooltip-right .tooltip-content::after {
    top: 50%;
    right: 100%;
    left: auto;
    transform: translateY(-50%);
    border-right-color: var(--color-primary);
    border-top-color: transparent;
}

.tooltip-right:hover .tooltip-content {
    transform: translateY(-50%) translateX(4px);
}

/* Tooltips con información extendida */
.tooltip-extended .tooltip-content {
    white-space: normal;
    max-width: 250px;
    text-align: left;
    line-height: var(--line-height-normal);
}

.tooltip-extended .tooltip-content .tooltip-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
    color: white;
}

.tooltip-extended .tooltip-content .tooltip-description {
    font-size: var(--font-size-xs);
    opacity: 0.9;
}

/* Tooltips de éxito, error, etc. */
.tooltip-success .tooltip-content {
    background: #10b981;
}

.tooltip-success .tooltip-content::after {
    border-top-color: #10b981;
}

.tooltip-error .tooltip-content {
    background: #ef4444;
}

.tooltip-error .tooltip-content::after {
    border-top-color: #ef4444;
}

.tooltip-warning .tooltip-content {
    background: #f59e0b;
}

.tooltip-warning .tooltip-content::after {
    border-top-color: #f59e0b;
}

.tooltip-info .tooltip-content {
    background: #3b82f6;
}

.tooltip-info .tooltip-content::after {
    border-top-color: #3b82f6;
}

/* Scroll Indicator */
.scroll-indicator {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    z-index: 100;
    opacity: 1;
    visibility: visible;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    user-select: none;
}

.scroll-indicator.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.scroll-indicator-text {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-meta);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    transition: all 0.3s ease;
}

.scroll-indicator-line {
    width: 1px;
    height: 40px;
    background: var(--color-text-meta);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.scroll-indicator-line::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: var(--color-primary);
    animation: scrollLineMove 2s ease-in-out infinite;
}

.scroll-indicator-arrow {
    font-size: var(--font-size-base);
    color: var(--color-text-meta);
    animation: scrollArrowBounce 2s ease-in-out infinite;
    transition: all 0.3s ease;
    line-height: 1;
}


/* Animaciones del scroll indicator */
@keyframes scrollLineMove {
    0% {
        transform: translateY(-100%);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(200%);
        opacity: 0;
    }
}

@keyframes scrollArrowBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(4px);
    }
}

/* Responsive para scroll indicator */
@media (max-width: 1024px) {
    .scroll-indicator {
        bottom: var(--space-md);
        right: var(--space-md);
        scale: 0.85;
    }
}

@media (max-width: 480px) {
    .scroll-indicator {
        bottom: var(--space-sm);
        right: var(--space-sm);
        scale: 0.75;
    }
    
    .scroll-indicator-text {
        font-size: 10px;
    }
    
    .scroll-indicator-line {
        height: 30px;
    }
}

/* Scroll to Top Button - Consistente con scroll indicator */
.scroll-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    user-select: none;
    background: transparent;
    border: none;
    padding: 0;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top-text {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-meta);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    transition: all 0.3s ease;
}

.scroll-to-top-line {
    width: 1px;
    height: 40px;
    background: var(--color-text-meta);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.scroll-to-top-line::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: var(--color-primary);
    animation: scrollTopLineMove 2s ease-in-out infinite;
}

.scroll-to-top-icon {
    font-size: var(--font-size-base);
    color: var(--color-text-meta);
    animation: scrollTopArrowBounce 2s ease-in-out infinite;
    transition: all 0.3s ease;
    line-height: 1;
}

.scroll-to-top:hover .scroll-to-top-text,
.scroll-to-top:hover .scroll-to-top-icon {
    color: var(--color-primary);
}

.scroll-to-top:hover .scroll-to-top-line {
    background: var(--color-primary);
}

.scroll-to-top:hover .scroll-to-top-line::before {
    background: var(--color-accent);
}

/* Animaciones del scroll to top */
@keyframes scrollTopLineMove {
    0% {
        transform: translateY(100%);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(-200%);
        opacity: 0;
    }
}

@keyframes scrollTopArrowBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-4px);
    }
}

/* Responsive para scroll to top */
@media (max-width: 1024px) {
    .scroll-to-top {
        bottom: var(--space-md);
        right: var(--space-md);
        scale: 0.85;
    }
}

@media (max-width: 480px) {
    .scroll-to-top {
        bottom: var(--space-sm);
        right: var(--space-sm);
        scale: 0.75;
    }
    
    .scroll-to-top-text {
        font-size: 10px;
    }
    
    .scroll-to-top-line {
        height: 30px;
    }
}

/* Footer compacto */
.footer {
    margin-top: var(--space-4xl);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface-alt);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin: 0;
}

.footer-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

/* Micro-animaciones */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.reference-card {
    animation: fadeIn 0.6s ease forwards;
}

.reference-card:nth-child(even) {
    animation-delay: 0.1s;
}

.reference-card:nth-child(3n) {
    animation-delay: 0.2s;
}