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

:root {
    /* Colores principales (Dark theme) */
    --primary-color: #60a5fa;
    --primary-dark: #2563eb;
    --primary-light: #93c5fd;
    --secondary-color: #818cf8;
    --accent-color: #fbbf24;
    --success-color: #22d3ee;
    --warning-color: #f59e42;
    --error-color: #f87171;

    /* Neutros / superficies */
    --bg: #0b0b0d;
    --surface-1: #0f1720;
    --surface-2: #111318;
    --surface-3: #1b1f26;
    --muted: #94a3b8;
    --text: #e6eef8;
    --muted-2: #cbd5e1;

    /* Tipografía */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* 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;

    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 24px rgba(2,6,23,0.5);
    --shadow-lg: 0 12px 40px rgba(2,6,23,0.6);
    --shadow-xl: 0 20px 60px rgba(2,6,23,0.65);

    /* Transiciones */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.28s cubic-bezier(.2,.9,.2,1);
    --transition-slow: 0.45s ease-in-out;

    /* Bordes */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
}

/* Estilos base */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text);
    background: linear-gradient(135deg, var(--surface-2) 0%, var(--bg) 100%);
    min-height: 100vh;
    overflow-x: hidden; /* prevent horizontal scroll */
}

/* Ensure media can't cause horizontal overflow */
img, video, iframe {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10,12,16,0.6);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255,255,255,0.04);
    z-index: 1000;
    transition: var(--transition-normal);
}

/* Header state when scrolled */
.header.scrolled {
    background: rgba(10,12,16,0.92);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-sm) + 0.25rem) var(--spacing-lg);
}

.nav-brand h2 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.4rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--muted-2);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: var(--transition-fast);
    border-radius: 3px;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
}

.nav-toggle span {
    width: 26px;
    height: 3px;
    background: var(--muted-2);
    transition: var(--transition-fast);
    border-radius: 2px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    background: linear-gradient(135deg, transparent 0%, rgba(0,0,0,0.15) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
    text-shadow: 0 6px 30px rgba(2,6,23,0.6);
}

.highlight {
    color: var(--primary-color);
    position: relative;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 60%;
    height: 6px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    opacity: 0.85;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--muted);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--muted-2);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    color: #071022;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: #071022;
}

.btn-outline {
    background: transparent;
    color: var(--muted-2);
    border-color: rgba(255,255,255,0.06);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.02);
    border-color: var(--primary-color);
}

/* Profile Card */
.profile-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
    border-radius: var(--border-radius-xl);
    padding: calc(var(--spacing-lg) + 0.25rem);
    box-shadow: var(--shadow-xl);
    text-align: center;
    transform: rotate(2deg);
    transition: var(--transition-normal);
}

/* Avatar (photo) adjustments - reduced size for a cleaner layout */
.profile-avatar {
    width: 250px;
    height: 250px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    box-shadow: 0 8px 24px rgba(2,6,23,0.6);
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 18% 30%; /* tweakable to center the face */
    display: block;
}

@media (max-width: 768px) {
    .profile-avatar {
        width: 160px;
        height: 160px;
    }
}


.profile-info h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.profile-info p {
    color: var(--muted);
    margin-bottom: var(--spacing-lg);
}

.profile-stats {
    display: flex;
    justify-content: space-around;
    gap: var(--spacing-lg);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--muted);
}

/* Sections */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--muted);
    font-size: 1.05rem;
    margin-bottom: var(--spacing-2xl);
}

/* About Section */
.about {
    padding: var(--spacing-3xl) 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.05rem;
    margin-bottom: var(--spacing-lg);
    color: var(--muted-2);
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.highlight-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
    border-radius: var(--border-radius-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(255,255,255,0.03);
}

.highlight-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.highlight-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.highlight-item h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

/* Projects Section */
.projects {
    padding: var(--spacing-3xl) 0;
}

.projects-filter {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid rgba(255,255,255,0.04);
    background: rgba(255,255,255,0.02);
    color: var(--muted-2);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    color: #071022;
    border-color: var(--primary-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.project-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255,255,255,0.03);
    flex: 1 1 auto; /* allow header to grow and keep footer pinned */
}

.project-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.project-description {
    color: var(--muted-2);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

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

.project-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255,255,255,0.02);
    color: var(--muted-2);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
}

.project-footer {
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    color: var(--primary-color);
    border: 1px solid rgba(96,165,250,0.25);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.project-link:hover {
    background: var(--primary-color);
    color: #071022;
}

.project-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--muted);
    font-size: 0.875rem;
}

/* Utility used by JS filters to hide cards */
.hidden {
    display: none !important;
}

/* Truncate long descriptions so cards keep a consistent height */
.project-description {
    color: var(--muted-2);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Slightly tighter card layout for a modern, compact look */
.project-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    min-height: 180px;
}
.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--muted);
}

.loading i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.github-link {
    text-align: center;
}

/* Empty / Error states inside projects grid */
.no-projects, .error-message {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--muted);
    background: rgba(255,255,255,0.01);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255,255,255,0.03);
}

.no-projects i, .error-message i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

/* Skills Section */
.skills {
    padding: var(--spacing-3xl) 0;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
}

.skill-category {
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255,255,255,0.03);
    transition: var(--transition-normal);
}

.skill-category:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.skill-category h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
    text-align: center;
}

.skills-list {
    display: grid;
    gap: var(--spacing-md);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255,255,255,0.01);
    border-radius: var(--border-radius-md);
    transition: var(--transition-fast);
}

.skill-item:hover {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    color: #071022;
    transform: translateX(6px) scale(1.02);
}

.skill-item i {
    font-size: 1.4rem;
    color: var(--primary-color);
    transition: var(--transition-fast);
}

.skill-item span {
    font-weight: 500;
}

/* Contact Section */
.contact {
    padding: var(--spacing-3xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.contact-item i {
    font-size: 1.4rem;
    color: var(--primary-color);
    width: 40px;
    text-align: center;
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text);
}

.contact-item p {
    color: var(--muted);
}

.contact-form {
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid rgba(255,255,255,0.04);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    transition: var(--transition-fast);
    font-family: var(--font-primary);
    background: transparent;
    color: var(--text);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(230,238,248,0.45);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 6px rgba(96,165,250,0.07);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: rgba(255,255,255,0.02);
    color: var(--muted-2);
    border-radius: 50%;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    font-size: 1.1rem;
}

.social-link:hover {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    color: #071022;
    transform: translateY(-6px) scale(1.06);
}

/* Footer */
.footer {
    background: transparent;
    color: rgba(230,238,248,0.7);
    text-align: center;
    padding: var(--spacing-xl) 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10,12,16,0.95);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

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

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

    .about-highlights {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .profile-card {
        transform: none;
    }

    .profile-card:hover {
        transform: scale(1.02);
    }
}

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

@keyframes fadeInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

.animate-on-scroll { opacity: 0; animation: fadeInUp 0.6s ease-out forwards; }
.animate-on-scroll.delay-1 { animation-delay: 0.1s; }
.animate-on-scroll.delay-2 { animation-delay: 0.2s; }
.animate-on-scroll.delay-3 { animation-delay: 0.3s; }