/* ========================================
   VARIABLES Y CONFIGURACIÓN BASE
   ======================================== */

:root {
    /* Colores primarios */
    --color-primary: #00f5ff;
    --color-secondary: #a855f7;
    --color-dark: #050505;
    --color-dark-light: #0a0a0a;
    --color-dark-card: #111111;

    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    --gradient-card: linear-gradient(135deg, rgba(0, 245, 255, 0.05), rgba(168, 85, 247, 0.05));

    /* Sombras */
    --shadow-glow: 0 0 30px rgba(0, 245, 255, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Timing de animaciones */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--color-dark);
    color: #f9fafb;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   FONDO ANIMADO
   ======================================== */

/* Grid animado en el fondo */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.15;
    background: 
        linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px),
        linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px);
    background-size: 100px 100px;
    animation: backgroundScroll 20s linear infinite;
}

@keyframes backgroundScroll {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(100px, 100px);
    }
}

/* Canvas para partículas */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ========================================
   NAVEGACIÓN
   ======================================== */

.nav-link {
    position: relative;
    color: #9ca3af;
    transition: color var(--transition-normal);
    padding: 0.5rem 0;
}

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

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

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

/* ========================================
   EFECTOS DE TEXTO
   ======================================== */

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
    background-size: 200% auto;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

/* Efecto de typing cursor */
.typing-cursor {
    display: inline-block;
    width: 2px;
    background-color: var(--color-primary);
    margin-left: 4px;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* ========================================
   TÍTULOS DE SECCIÓN
   ======================================== */

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    position: relative;
    display: inline-block;
}

.section-title::before {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* ========================================
   BOTONES
   ======================================== */

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--gradient-primary);
    color: var(--color-dark);
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: transparent;
    color: var(--color-primary);
    font-weight: 600;
    border-radius: 0.5rem;
    border: 2px solid var(--color-primary);
    transition: all var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
}

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

/* ========================================
   TARJETAS DE PROYECTO (GLASSMORPHISM)
   ======================================== */

.project-card {
    background: rgba(17, 17, 17, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-primary);
    box-shadow: 0 20px 60px rgba(0, 245, 255, 0.2);
}

.project-image {
    position: relative;
    overflow: hidden;
}

.project-card:hover .project-image > div {
    transform: scale(1.1);
}

.project-image > div {
    transition: transform var(--transition-slow);
}

/* Tags de tecnología */
.tech-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(0, 245, 255, 0.1);
    color: var(--color-primary);
    border: 1px solid rgba(0, 245, 255, 0.3);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.tech-tag:hover {
    background: var(--color-primary);
    color: var(--color-dark);
    transform: translateY(-2px);
}

/* ========================================
   TIMELINE (EXPERIENCIA)
   ======================================== */

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}

.timeline-item {
    position: relative;
    padding-bottom: 3rem;
}

.timeline-dot {
    position: absolute;
    left: -2.5rem;
    top: 0;
    width: 1rem;
    height: 1rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--color-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px var(--color-primary);
    }
    50% {
        box-shadow: 0 0 30px var(--color-primary);
    }
}

.timeline-content {
    background: rgba(17, 17, 17, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-content {
    border-color: var(--color-primary);
    transform: translateX(10px);
}

/* ========================================
   TARJETAS DE CRISTAL (GLASS CARDS)
   ======================================== */

.glass-card {
    background: rgba(17, 17, 17, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 245, 255, 0.15);
}

/* Badge de certificación */
.badge-cert {
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    color: var(--color-dark);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
}

/* ========================================
   ENLACES SOCIALES
   ======================================== */

.social-link {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(17, 17, 17, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    color: #9ca3af;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: var(--color-dark);
    border-color: transparent;
    transform: translateY(-5px) rotate(5deg);
    box-shadow: var(--shadow-glow);
}

/* ========================================
   SCROLL TO TOP BUTTON
   ======================================== */

.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    background: var(--gradient-primary);
    color: var(--color-dark);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top-btn:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

/* ========================================
   ANIMACIONES DE ENTRADA (SCROLL REVEAL)
   ======================================== */

.reveal-up {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-up.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   MENSAJE DEL FORMULARIO
   ======================================== */

#form-message.success {
    background: rgba(0, 245, 255, 0.1);
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

#form-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid #ef4444;
    color: #ef4444;
}

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

@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-dot {
        left: -2rem;
    }

    .scroll-top-btn {
        bottom: 1rem;
        right: 1rem;
        width: 2.5rem;
        height: 2.5rem;
    }
}

/* ========================================
   UTILIDADES ADICIONALES
   ======================================== */

/* Contenedor principal con z-index para que esté sobre el fondo */
section {
    position: relative;
    z-index: 10;
}

/* Smooth scroll para enlaces internos */
a[href^="#"] {
    scroll-margin-top: 80px;
}

/* Selección de texto personalizada */
::selection {
    background: var(--color-primary);
    color: var(--color-dark);
}

::-moz-selection {
    background: var(--color-primary);
    color: var(--color-dark);
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-dark);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* ========================================
   ANIMACIONES DE CARGA
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

body {
    animation: fadeIn 0.5s ease-in;
}

/* ========================================
   EFECTOS HOVER AVANZADOS
   ======================================== */

/* Efecto de brillo en hover */
@keyframes shine {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Efecto de resplandor en tarjetas */
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.1), transparent);
    transition: left 0.7s;
}

.project-card:hover::before {
    left: 100%;
}