/* ========================================
   LANDING PAGE - PORTFOLIO PROFESIONAL
   Autor: Tu Nombre
   Versión: 1.0 (EJERCICIO CON ERRORES)
   ========================================
   
   ¡¡¡ EJERCICIO PARA ESTUDIANTES !!!
   
   Este archivo contiene ERRORES INTENCIONALES que debes encontrar y corregir.
   
   INSTRUCCIONES:
   1. Busca los comentarios que comienzan con "ERROR #" para encontrar los problemas
   2. Lee la PISTA para entender qué está mal
   3. Si el error es AVANZADO, la SOLUCIÓN completa está incluida
   4. Corrige el código y observa los cambios en el navegador
   
   TOTAL DE ERRORES EN CSS: 18
   - Errores simples (solo pista): 13
   - Errores avanzados (con solución): 5
   
   TEMAS QUE PRACTICARÁS:
   - Variables CSS
   - Flexbox y Grid
   - Box model (margin, padding, border-radius)
   - Transiciones y animaciones
   - Selectores (incluyendo pseudoclases y pseudoelementos)
   - Z-index y posicionamiento
   
   ¡Buena suerte!
   ======================================== */

/* ========== VARIABLES CSS ========== */
:root {
    /* Colores principales */
    /* ERROR 1: El color primario no es el correcto, debería ser un cyan vibrante
       PISTA: Revisa el valor hexadecimal, el original era un tono cyan (#0ea5e9) */
    --color-primary: #0ea5e9;          /* Cyan vibrante */
    --color-primary-dark: #0284c7;
    --color-primary-light: #38bdf8;
    --color-secondary: #8b5cf6;         /* Violeta eléctrico */
    --color-secondary-dark: #7c3aed;
    
    /* Colores de fondo */
    --color-bg-primary: #0f172a;        /* Azul medianoche */
    --color-bg-secondary: #1e293b;      /* Gris pizarra oscuro */
    --color-bg-tertiary: #334155;       /* Gris pizarra */
    --color-bg-card: #1e293b;
    
    /* Colores de texto */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    --gradient-bg: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.3);
    --shadow-glow-secondary: 0 0 20px rgba(139, 92, 246, 0.3);
    
    /* Tipografía */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Bordes */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-2xl: 1.5rem;
    --border-radius-full: 9999px;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index */
    /* ERROR 2: El header queda detrás del contenido al hacer scroll
       PISTA: El valor del z-index es muy bajo para un elemento fijo */
    --z-fixed: 1500;
    --z-modal: 1000;
    
    /* Header */
    --header-height: 4rem;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

/* ========== LAYOUT ========== */
.container {
    max-width: 1200px;
    /* ERROR 3: El contenido no está centrado en la página
       PISTA: Falta una propiedad que centra elementos de bloque horizontalmente */
    padding: 0 var(--spacing-lg);
        margin: 0 auto;
}

.section {
    padding: var(--spacing-4xl) 0;
}

/* ========== TYPOGRAPHY ========== */
.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section__subtitle {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.section__title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section__description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--border-radius-lg);
    /* ERROR 4 (AVANZADO): Los botones cambian de estado de forma abrupta sin suavidad
       SOLUCIÓN: Falta la propiedad transition para animar los cambios de estado
       Agregar: transition: all var(--transition-base);
       Esto hace que el hover y otros estados se animen suavemente */
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-base);
}

.btn--primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    /* ERROR 5: El botón primario no tiene profundidad ni efecto de brillo
       PISTA: Falta la propiedad que agrega sombras al elemento */
    transition: all var(--transition-base);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), 0 0 30px rgba(14, 165, 233, 0.4);
}

.btn--outline {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-bg-tertiary);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(14, 165, 233, 0.1);
}

.btn--secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: none;
}

.btn--secondary:hover {
    background: var(--color-secondary);
    box-shadow: var(--shadow-glow-secondary);
}

.btn--large {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

.btn--full {
    width: 100%;
}

/* ========== HEADER ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.nav {
    display: flex;
    align-items: center;
    /* ERROR 6: Los elementos del nav no están alineados verticalmente al centro
       PISTA: Falta una propiedad de flexbox que alinea items en el eje transversal */
    justify-content: space-between;
    height: 100%;
    
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

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

.logo__bracket {
    color: var(--color-primary);
}

.nav__list {
    display: flex;
    gap: var(--spacing-xl);
}

.nav__link {
    position: relative;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    padding: var(--spacing-sm) 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
    /* ERROR 7 (AVANZADO): La línea debajo del link aparece de golpe sin animación
       SOLUCIÓN: Falta la transición para la propiedad width
       Agregar: transition: width var(--transition-base);
       Esto hace que la línea se expanda suavemente al hacer hover */
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-text-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
    width: 100%;
}

/* Checkbox oculto para menú móvil */
.nav__checkbox {
    display: none;
}

.nav__item label {
    cursor: pointer;
}

.nav__toggle,
.nav__close {
    display: none;
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    cursor: pointer;
}

/* ========== HERO SECTION ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    background: var(--gradient-bg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__greeting {
    display: inline-block;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-md);
    /* ERROR 8: Los botones del hero están pegados sin espacio entre ellos
       PISTA: Falta la propiedad que define el espacio entre elementos flex */
    flex-wrap: wrap;
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero__blob {
    width: 350px;
    height: 350px;
    background: var(--gradient-primary);
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: blob-animation 10s infinite;
    /* ERROR 9: El blob en el hero no tiene la animación de forma dinámica
       PISTA: Falta la propiedad animation que referencia a blob-animation */
    position: relative;
}

@keyframes blob-animation {
    0%, 100% {
        border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    }
    50% {
        border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
    }
}

.hero__avatar {
    width: 280px;
    height: 280px;
    background: var(--color-bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    color: var(--color-primary);
}

.hero__decoration {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    animation: float 3s ease-in-out infinite;
}

.hero__decoration--1 {
    top: 10%;
    left: 10%;
    background: var(--color-primary);
    animation-delay: 0s;
}

.hero__decoration--2 {
    top: 20%;
    right: 10%;
    background: var(--color-secondary);
    animation-delay: 1s;
}

.hero__decoration--3 {
    bottom: 20%;
    left: 20%;
    background: var(--color-primary-light);
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero__scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
}

.hero__scroll-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* ========== INTERESTS SECTION ========== */
.interests {
    background: var(--color-bg-secondary);
}

.interests__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* ERROR 10: Las cards de intereses no se muestran en 3 columnas, están apiladas
       PISTA: Falta la propiedad de CSS Grid que define las columnas */
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.interest__card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--border-radius-lg);
    /* ERROR 11: Las cards de intereses tienen esquinas puntiagudas en vez de redondeadas
       PISTA: Falta la propiedad border-radius */
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.interest__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
    /* ERROR 12 (AVANZADO): La línea superior de las cards aparece instantáneamente sin animación
       SOLUCIÓN: Falta la transición para la propiedad transform
       Agregar: transition: transform var(--transition-base);
       El pseudoelemento ::before necesita su propia transición para animar el scaleX */
}

.interest__card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.interest__card:hover::before {
    transform: scaleX(1);
}

.card__icon {
    width: 60px;
    height: 60px;
    background: rgba(14, 165, 233, 0.1);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
}

.interest__card:hover .card__icon {
    background: var(--gradient-primary);
    color: white;
    transform: scale(1.1);
}

.card__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.card__description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

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

.tag {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-primary);
    background: rgba(14, 165, 233, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-full);
}

/* Subjects */
.subjects {
    background: var(--color-bg-card);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
}

.subjects__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.subjects__title i {
    color: var(--color-secondary);
}

.subjects__list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.subject {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-base);
}

.subject:hover {
    background: var(--gradient-primary);
    color: white;
    transform: translateY(-2px);
}

/* ========== CV SECTION ========== */
.cv {
    background: var(--color-bg-primary);
    position: relative;
}

.cv::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 0% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 100% 50%, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.cv__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.cv__description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.cv__buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.cv__social-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

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

.social__card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: all var(--transition-base);
}

.social__card:hover {
    transform: translateX(10px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.social__icon {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
}

.social__icon--linkedin {
    background: rgba(0, 119, 181, 0.2);
    color: #0077b5;
}

/* ERROR 13 (AVANZADO): El icono de GitHub no tiene color visible
   SOLUCIÓN: Falta la propiedad color para el texto/icono
   Agregar: color: var(--color-text-primary);
   Los selectores específicos como --github necesitan definir su propio color */

.social__icon--github {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

.social__icon--email {
    background: rgba(14, 165, 233, 0.2);
    color: var(--color-primary);
}

.social__info {
    flex: 1;
}

.social__name {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
}

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

.social__arrow {
    color: var(--color-text-muted);
    transition: all var(--transition-base);
}

.social__card:hover .social__arrow {
    color: var(--color-primary);
    transform: translateX(5px);
}

/* ========== PROJECTS SECTION ========== */
.projects {
    background: var(--color-bg-secondary);
}

.projects__grid {
    /* ERROR 14: Los proyectos no se muestran en columnas, solo apilados
       PISTA: Falta definir cómo se distribuyen las columnas en el grid */
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.project__card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.project__card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.project__image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project__placeholder {
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    opacity: 0.8;
}

.project__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-base);
}

/* ERROR 15 (AVANZADO): El overlay de los proyectos no aparece al hacer hover
   SOLUCIÓN: El selector está mal escrito, debería ser .project__card:hover .project__overlay
   El selector correcto utiliza :hover en el contenedor padre para afectar al hijo
   Cambiar project__card-hover por .project__card:hover */
.project__card:hover .project__overlay {
    opacity: 1;
}

.project__link {
    width: 50px;
    height: 50px;
    background: var(--color-bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.project__link:hover {
    background: var(--color-primary);
    color: white;
    transform: scale(1.1);
}

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

.project__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.project__description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

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

.tech {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-secondary);
    background: rgba(139, 92, 246, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

.projects__more {
    text-align: center;
    margin-top: var(--spacing-3xl);
}

/* ========== CONTACT SECTION ========== */
.contact {
    background: var(--color-bg-primary);
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 50% 0%, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.contact__description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.contact__data {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.contact__icon {
    width: 50px;
    height: 50px;
    background: rgba(14, 165, 233, 0.1);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-primary);
}

.contact__label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.contact__value {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-primary);
}

.contact__value--available {
    color: #10b981;
}

.contact__card {
    /* ERROR 18: La card de contacto no tiene el fondo degradado
       PISTA: Falta la propiedad background con el gradiente primario */
    background: var(--gradient-primary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
}

.contact__card-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-md);
}

.contact__card-text {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
}

.contact__card .btn--primary {
    background: white;
    color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

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

/* ========== FOOTER ========== */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-bg-tertiary);
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-bg-tertiary);
}

.footer__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.footer__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
    max-width: 300px;
}

.footer__social {
    /* ERROR 16: Los iconos de redes sociales del footer están apilados verticalmente
       PISTA: Falta la propiedad display que permite alinear elementos en fila */
    gap: var(--spacing-md);
    display: flex;
}

.footer__social-link {
    width: 45px;
    height: 45px;
    background: var(--color-bg-tertiary);
    border-radius: 50%;
    /* ERROR 17: Los iconos de redes sociales son cuadrados en vez de círculos
       PISTA: Falta una propiedad de borde para hacer elementos circulares */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.footer__social-link:hover {
    background: var(--gradient-primary);
    color: white;
    transform: translateY(-5px);
}

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

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

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

.footer__made i {
    color: #ef4444;
}

/* ========== SCROLL TO TOP ========== */
.scroll-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    opacity: 1;
    visibility: visible;
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl), 0 0 30px rgba(14, 165, 233, 0.5);
}

/* ========== RESPONSIVE ========== */

/* Tablets */
@media screen and (max-width: 1024px) {
    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero__content {
        order: 2;
    }
    
    .hero__image {
        order: 1;
    }
    
    .hero__description {
        margin: 0 auto var(--spacing-xl);
    }
    
    .hero__buttons {
        justify-content: center;
    }
    
    .hero__blob {
        width: 280px;
        height: 280px;
    }
    
    .hero__avatar {
        width: 220px;
        height: 220px;
        font-size: 6rem;
    }
    
    .interests__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cv__content,
    .contact__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .projects__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile Large */
@media screen and (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    /* Mobile Navigation - CSS Only */
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background: var(--color-bg-secondary);
        padding: var(--spacing-4xl) var(--spacing-xl);
        transition: right var(--transition-base);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    }
    
    /* Cuando el checkbox está marcado, mostrar el menú */
    .nav__checkbox:checked ~ .nav__menu {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .nav__link {
        font-size: var(--font-size-lg);
    }
    
    .nav__close {
        display: block;
        position: absolute;
        top: var(--spacing-lg);
        right: var(--spacing-lg);
        font-size: var(--font-size-2xl);
    }
    
    .nav__toggle {
        display: block;
    }
    
    .hero__title {
        font-size: var(--font-size-4xl);
    }
    
    .hero__blob {
        width: 220px;
        height: 220px;
    }
    
    .hero__avatar {
        width: 180px;
        height: 180px;
        font-size: 5rem;
    }
    
    .interests__grid,
    .projects__grid {
        grid-template-columns: 1fr;
    }
    
    .cv__buttons {
        flex-direction: column;
    }
    
    .cv__buttons .btn {
        width: 100%;
    }
    
    .footer__content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-xl);
    }
    
    .footer__text {
        max-width: 100%;
    }
    
    .footer__bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* Mobile Small */
@media screen and (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero__buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .hero__buttons .btn {
        width: 100%;
    }
    
    .hero__blob {
        width: 180px;
        height: 180px;
    }
    
    .hero__avatar {
        width: 140px;
        height: 140px;
        font-size: 4rem;
    }
    
    .interest__card {
        padding: var(--spacing-lg);
    }
    
    .project__image {
        height: 160px;
    }
    
    .contact__card {
        padding: var(--spacing-xl);
    }
    
    .scroll-top {
        right: var(--spacing-md);
        bottom: var(--spacing-md);
        width: 45px;
        height: 45px;
    }
}

/* Animations for page load */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero__greeting,
.hero__title,
.hero__subtitle,
.hero__description,
.hero__buttons {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

.hero__greeting { animation-delay: 0.1s; }
.hero__title { animation-delay: 0.2s; }
.hero__subtitle { animation-delay: 0.3s; }
.hero__description { animation-delay: 0.4s; }
.hero__buttons { animation-delay: 0.5s; }

.hero__image {
    animation: fadeInUp 0.8s ease-out 0.3s forwards;
    opacity: 0;
}

/* Print styles */
@media print {
    .header,
    .hero__scroll,
    .scroll-top,
    .nav__toggle {
        display: none;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    body {
        background: white;
        color: black;
    }
}