/* CSS Variables */
:root {
    --color-bg: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #21262d;
    --color-text: #f0f6fc;
    --color-text-secondary: #8b949e;
    --color-text-muted: #6e7681;
    --color-accent: #10b981;
    --color-accent-hover: #059669;
    --color-blue: #3b82f6;
    --color-blue-hover: #2563eb;
    --color-border: #30363d;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: all 0.3s ease;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

/* ==================== FLOATING ICONS BACKGROUND ==================== */
.floating-icons {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.floating-icon {
    position: absolute;
    font-size: 2rem;
    opacity: 0.08;
    animation: float linear infinite;
    filter: grayscale(50%);
    user-select: none;
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.08;
    }
    90% {
        opacity: 0.08;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* ==================== LETTER ANIMATIONS ==================== */
.letter-animate {
    display: inline-block;
    opacity: 0;
    transform: translateY(50px) rotateX(-90deg);
    animation: letterReveal 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.letter-animate.space {
    width: 0.3em;
}

@keyframes letterReveal {
    0% {
        opacity: 0;
        transform: translateY(50px) rotateX(-90deg);
    }
    100% {
        opacity: 1;
        transform: translateY(0) rotateX(0);
    }
}

/* Stagger delay for each letter */
.letter-animate:nth-child(1) { animation-delay: 0.5s; }
.letter-animate:nth-child(2) { animation-delay: 0.55s; }
.letter-animate:nth-child(3) { animation-delay: 0.6s; }
.letter-animate:nth-child(4) { animation-delay: 0.65s; }
.letter-animate:nth-child(5) { animation-delay: 0.7s; }
.letter-animate:nth-child(6) { animation-delay: 0.75s; }
.letter-animate:nth-child(7) { animation-delay: 0.8s; }
.letter-animate:nth-child(8) { animation-delay: 0.85s; }
.letter-animate:nth-child(9) { animation-delay: 0.9s; }
.letter-animate:nth-child(10) { animation-delay: 0.95s; }
.letter-animate:nth-child(11) { animation-delay: 1s; }
.letter-animate:nth-child(12) { animation-delay: 1.05s; }
.letter-animate:nth-child(13) { animation-delay: 1.1s; }
.letter-animate:nth-child(14) { animation-delay: 1.15s; }
.letter-animate:nth-child(15) { animation-delay: 1.2s; }

/* Text reveal animation */
.text-reveal {
    display: inline-block;
    overflow: hidden;
}

.animate-text .text-reveal {
    animation: textSlideIn 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    opacity: 0;
    transform: translateX(-20px);
}

@keyframes textSlideIn {
    0% {
        opacity: 0;
        transform: translateX(-20px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Typing cursor */
.cursor {
    display: inline-block;
    animation: blink 1s step-end infinite;
    color: var(--color-accent);
    font-weight: 300;
}

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

/* Slide up animation */
.animate-slide-up {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.8s ease forwards;
    animation-delay: 2s;
}

@keyframes slideUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hover effect for title letters */
.hero-title:hover .letter-animate {
    animation: letterWave 0.5s ease forwards;
}

.hero-title .letter-animate:hover {
    color: var(--color-accent);
    transform: translateY(-8px) scale(1.1);
    transition: all 0.2s ease;
}

@keyframes letterWave {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* ==================== GLOWING TEXT EFFECTS ==================== */
.greeting {
    color: var(--color-accent);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 0.75rem;
    perspective: 1000px;
}

.hero-title .letter-animate {
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 50%, var(--color-blue) 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: letterReveal 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards,
               gradientShift 8s ease infinite;
}

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

.hero-subtitle {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
    min-height: 2.5rem;
}

.typing-text {
    border-right: none;
}

/* ==================== HEADER ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-blue));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { 
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
        transform: scale(1);
    }
    50% { 
        box-shadow: 0 0 20px 5px rgba(16, 185, 129, 0.2);
        transform: scale(1.02);
    }
}

.logo-text {
    font-weight: 600;
    font-size: 1.125rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    padding: 0.25rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

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

.nav-links a:hover {
    color: var(--color-text);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 99;
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    padding: 0.75rem 1rem;
    color: var(--color-text-secondary);
    border-radius: 8px;
}

.mobile-menu a:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

/* ==================== HERO SECTION ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 1.5rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 700px;
}

.hero-description {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    max-width: 540px;
}

.hero-links {
    display: flex;
    gap: 1rem;
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
    animation-delay: 2.2s;
}

@keyframes fadeIn {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

.social-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    color: var(--color-text-secondary);
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--color-accent);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
    z-index: -1;
}

.social-link:hover::before {
    width: 150%;
    height: 150%;
}

.social-link:hover {
    color: var(--color-bg);
    border-color: var(--color-accent);
    transform: translateY(-4px) rotate(5deg);
}

/* ==================== SECTIONS ==================== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-blue));
    border-radius: 2px;
}

.section-subtitle {
    color: var(--color-text-secondary);
    font-size: 1rem;
    margin-top: 1rem;
}

/* ==================== PROJECTS ==================== */
.projects {
    padding: 6rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 500px), 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    transform: scaleX(0);
    transition: transform 0.5s ease;
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover), 0 0 30px rgba(16, 185, 129, 0.1);
    border-color: var(--color-accent);
}

.project-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--color-bg-tertiary);
    transition: var(--transition);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(13, 17, 23, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: var(--color-bg);
    font-weight: 600;
    border-radius: 8px;
    transform: translateY(10px);
    transition: var(--transition);
}

.project-card:hover .project-link {
    transform: translateY(0);
}

.project-link:hover {
    background: var(--color-accent-hover);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
}

.project-info {
    padding: 1.5rem;
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.project-badge {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.project-badge.academia {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-accent);
}

.project-badge.prestamos {
    background: rgba(59, 130, 246, 0.15);
    color: var(--color-blue);
}

.project-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tag {
    padding: 0.35rem 0.75rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-muted);
    font-size: 0.8rem;
    border-radius: 6px;
    transition: var(--transition);
}

.tag:hover {
    background: var(--color-bg);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.project-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.project-cta::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width 0.3s ease;
}

.project-cta:hover::after {
    width: 100%;
}

.project-cta:hover {
    color: var(--color-accent-hover);
}

[data-project="prestamos"] .project-cta {
    color: var(--color-blue);
}

[data-project="prestamos"] .project-cta:hover {
    color: var(--color-blue-hover);
}

[data-project="prestamos"]::before {
    background: linear-gradient(90deg, transparent, var(--color-blue), transparent);
}

[data-project="prestamos"]:hover {
    box-shadow: var(--shadow-hover), 0 0 30px rgba(59, 130, 246, 0.1);
    border-color: var(--color-blue);
}

/* ==================== SKILLS ==================== */
.skills {
    padding: 6rem 1.5rem;
    background: var(--color-bg-secondary);
    position: relative;
    z-index: 1;
}

.skills .section-header,
.skills .skills-grid {
    max-width: 1200px;
    margin: 0 auto;
}

.skills .skills-grid {
    margin-top: 3rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(16, 185, 129, 0.1), transparent);
    transition: left 0.5s ease;
}

.skill-item:hover::before {
    left: 100%;
}

.skill-item:hover {
    border-color: var(--color-accent);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.15);
}

.skill-icon {
    color: var(--color-accent);
    transition: var(--transition);
}

.skill-item:hover .skill-icon {
    transform: scale(1.2) rotate(10deg);
    filter: drop-shadow(0 0 10px rgba(16, 185, 129, 0.5));
}

.skill-item span {
    font-weight: 500;
    font-size: 0.95rem;
    text-align: center;
}

/* ==================== CONTACT ==================== */
.contact {
    padding: 6rem 1.5rem;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.contact-content {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 3rem 2rem;
    position: relative;
    overflow: hidden;
}

.contact-content::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, var(--color-accent), transparent, var(--color-blue), transparent);
    animation: rotate 10s linear infinite;
    opacity: 0.05;
}

@keyframes rotate {
    100% { transform: rotate(360deg); }
}

.contact .section-title {
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.contact-text {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto 2rem;
    position: relative;
    z-index: 1;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--color-accent), var(--color-blue));
    color: var(--color-bg);
    font-weight: 600;
    font-size: 1rem;
    border-radius: 10px;
    margin-bottom: 2.5rem;
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.contact-btn::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 ease;
}

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

.contact-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    position: relative;
    z-index: 1;
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.contact-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.contact-item a {
    color: var(--color-text-secondary);
    position: relative;
}

.contact-item a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.contact-item a:hover::after {
    width: 100%;
}

.contact-item a:hover {
    color: var(--color-accent);
}

/* ==================== FOOTER ==================== */
.footer {
    padding: 2rem 1.5rem;
    text-align: center;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding-top: 6rem;
    }

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

    .contact-content {
        padding: 2rem 1.5rem;
    }

    .contact-item {
        flex-direction: column;
        text-align: center;
    }
    
    .floating-icon {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .project-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

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

/* ==================== SELECTION ==================== */
::selection {
    background: var(--color-accent);
    color: var(--color-bg);
}