:root {
    /* Default - Dark Theme (Midnight & Violet) */
    --bg-main: #0a0c12;
    --bg-card: rgba(18, 22, 33, 0.7);
    --accent-hero: linear-gradient(135deg, #a78bfa 0%, #22d3ee 100%);
    --accent-primary: #a78bfa;
    /* Soft Violet */
    --accent-secondary: #22d3ee;
    /* Cyan */
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-glass: rgba(255, 255, 255, 0.08);
    --nav-bg: rgba(10, 12, 18, 0.8);
    --shadow-main: 0 8px 32px 0 rgba(0, 0, 0, 0.4);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-main: #f1f5f9;
        --bg-card: rgba(255, 255, 255, 0.7);
        --accent-hero: linear-gradient(135deg, #6366f1 0%, #0ea5e9 100%);
        --accent-primary: #6366f1;
        /* Indigo */
        --accent-secondary: #0ea5e9;
        /* Sky Blue */
        --text-main: #1e293b;
        --text-muted: #64748b;
        --border-glass: rgba(0, 0, 0, 0.05);
        --nav-bg: rgba(241, 245, 249, 0.8);
        --shadow-main: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    }
}

#matrix-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    opacity: 0.15;
    pointer-events: none;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Background Gradients */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 10% 20%, var(--accent-primary) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, var(--accent-secondary) 0%, transparent 20%);
    opacity: 0.05;
    pointer-events: none;
    z-index: -1;
}

/* Typography */
h1,
h2,
h3 {
    font-weight: 700;
    letter-spacing: -0.03em;
}

.mono {
    font-family: var(--font-mono);
}

/* About Section Layout */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    .about-container {
        grid-template-columns: 1fr;
    }
}

/* Terminal Widget */
.terminal-widget {
    background: #0d0f14;
    padding: 0;
    overflow: hidden;
    border-color: var(--border-glass);
    height: 300px;
    display: flex;
    flex-direction: column;
}

.terminal-header {
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 15px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border-glass);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.red {
    background: #ff5f56;
}

.yellow {
    background: #ffbd2e;
}

.green {
    background: #27c93f;
}

.terminal-header .title {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
}

.terminal-scroll {
    flex: 1;
    padding: 15px;
    font-size: 0.85rem;
    overflow-y: auto;
    color: var(--accent-secondary);
}

.terminal-input-line {
    padding: 10px 15px;
    display: flex;
    gap: 10px;
    background: rgba(0, 0, 0, 0.2);
}

.prompt {
    color: var(--accent-primary);
    white-space: nowrap;
}

#terminal-input {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    width: 100%;
    outline: none;
}

.response {
    color: var(--text-muted);
    margin-bottom: 8px;
}

/* Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}


/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.25rem 10%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--accent-hero);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    margin-left: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 10%;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero .glitch-text {
    background: var(--accent-hero);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Skills Section */
section {
    padding: 120px 10%;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    text-align: center;
    opacity: 0.9;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.skill-category h3 {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.project-card .tags {
    margin-top: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 4px 10px;
    background: rgba(167, 139, 250, 0.1);
    color: var(--accent-primary);
    border-radius: 20px;
    border: 1px solid rgba(167, 139, 250, 0.2);
}

/* Buttons */
.btn {
    padding: 14px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-block;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    background: var(--accent-hero);
    color: white;
    border: none;
}

.btn-primary:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transform: scale(1.05);
}

/* Social Links Expansion */
.contact-card {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    color: var(--text-main);
    text-decoration: none;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    white-space: nowrap;
    box-shadow: var(--shadow-main);
}

.social-btn i {
    font-size: 1.5rem;
    min-width: 60px;
    transition: transform 0.3s ease;
}

.social-btn span {
    opacity: 0;
    max-width: 0;
    margin-left: 0;
    transition: all 0.5s ease;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

.social-btn:hover {
    width: 240px;
    border-radius: 30px;
    color: #fff;
    border-color: transparent;
}

.social-btn:hover span {
    opacity: 1;
    max-width: 180px;
    margin-left: 10px;
    margin-right: 20px;
}

.social-btn:hover i {
    transform: rotate(360deg);
}

/* Platform specific brand colors */
.social-btn.x:hover {
    background: #000;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
}

.social-btn.facebook:hover {
    background: #1877F2;
    box-shadow: 0 0 20px rgba(24, 119, 242, 0.6);
}

.social-btn.email:hover {
    background: #ea4335;
    box-shadow: 0 0 20px rgba(234, 67, 53, 0.6);
}

.social-btn.whatsapp:hover {
    background: #25D366;
    box-shadow: 0 0 20px rgba(37, 211, 102, 0.6);
}

/* Footer */
footer {
    padding: 4rem 10%;
    text-align: center;
    border-top: 1px solid var(--border-glass);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    nav {
        padding: 1rem 5%;
    }

    .nav-links {
        display: none;
        /* Simplification for small screens */
    }

    section {
        padding: 80px 5%;
    }
}