:root {
    --bg-color: #111111;
    --divider-color: #2A2A2A; /* Deep dark gray for separators */
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --accent-color: #D3D0C9; /* Cream/Grey color */
    --accent-hover: #A9A9A9;
    --hover-bg: #1A1A1A;
    --input-bg: #0A0A0A;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    border-radius: 0 !important; /* STRICT GEOMETRY RULE */
}

html {
    scroll-behavior: smooth;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}


.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 800px;
}

/* Button & Link Base Styles */
a {
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--text-primary);
    color: #111;
}

.btn-primary:hover {
    background-color: var(--accent-color);
    color: #111;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--divider-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent-color);
    background-color: var(--accent-color);
    color: #111;
}

/* Header Navigation */
header {
    background-color: rgba(17, 17, 17, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--divider-color);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.15em;
}

#nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

#nav-menu a {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    position: relative;
    padding: 0.5rem 0;
}

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

#nav-menu a:hover::after {
    width: 100%;
}

.nav-contact-btn {
    border: 1px solid var(--text-primary);
    padding: 0.5rem 1.5rem !important;
}

.nav-contact-btn::after {
    display: none;
}

.nav-contact-btn:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: #111 !important;
}

/* Hamburger Menu */
.header-actions {
    display: none;
}

.hamburger {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0;
}

/* Sections Base */
.section {
    padding: 8rem 0;
    border-bottom: 1px solid var(--divider-color);
}

.section-header {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2rem;
    display: inline-block;
    padding-bottom: 0.5rem;
    border-bottom: 4px solid var(--accent-color);
}

/* Hero Section */
.hero-section {
    padding-top: 14rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-title {
    font-size: 4.5rem;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 800px;
    text-transform: none;
}

/* About Section */
.about-content {
    border-left: 2px solid var(--accent-color);
    padding-left: 2rem;
}

.about-content p {
    font-size: 1.25rem;
    line-height: 1.8;
}

/* Portfolio Section */
.project-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border: 1px solid var(--divider-color);
}

.project-card {
    padding: 3rem;
    border: 1px solid var(--divider-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    background-color: var(--hover-bg);
    border-color: var(--accent-color);
    z-index: 1; /* Bring borders above adjacent elements */
    position: relative;
}

.project-img {
    width: 100%;
    height: 180px; /* Reducido para hacerlas más pequeñas */
    object-fit: contain; /* 'contain' evita que se recorten */
    margin-bottom: 1.5rem;
    padding: 1rem; /* Espaciado interno para que respiren */
    background-color: rgba(0, 0, 0, 0.2); /* Fondo oscuro sutil para imágenes con transparencia (SVG/PNG) */
    border: 1px solid var(--divider-color);
    border-radius: 12px; /* User requested rounded corners for images */
}

.project-title {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.project-desc {
    margin-bottom: 2rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tech span {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--divider-color);
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* Tech Stack Section */
.stack-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem;
}

.stack-title {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.stack-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1px; /* create fine grid lines */
    background-color: var(--divider-color);
    border: 1px solid var(--divider-color);
}

.stack-item {
    background-color: rgba(0,0,0,0.4);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    transition: all 0.3s ease;
    color: var(--text-secondary);
}

.stack-item i {
    transition: all 0.3s ease;
    filter: grayscale(100%);
    opacity: 0.7;
}

.stack-item:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
    transform: translateY(-5px);
}

.stack-item:hover i {
    filter: grayscale(0%);
    opacity: 1;
    color: var(--icon-color, var(--text-primary));
}

.stack-item span {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Contact Section */
.contact-section {
    border-bottom: none;
}

.contact-card {
    background-color: rgba(0,0,0,0.5);
    border: 1px solid var(--divider-color);
    padding: 4rem 2rem;
    transition: border-color 0.3s ease;
}

.contact-card:hover {
    border-color: var(--accent-color);
}

.contact-title {
    font-size: 2rem;
    margin-bottom: 3rem;
    text-align: center;
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-links-col {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    border: 1px solid var(--divider-color);
    transition: all 0.3s ease;
    background-color: rgba(0,0,0,0.3);
}

.contact-link:hover {
    border-color: var(--accent-color);
    background-color: var(--hover-bg);
    transform: translateX(10px);
}

.contact-link i {
    color: var(--accent-color);
}

.contact-link span {
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
    padding: 1rem;
    background-color: var(--input-bg);
    border: 1px solid var(--divider-color);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background-color: #111;
}

.form-submit {
    width: 100%;
    margin-top: 1rem;
}

/* Footer */
.footer {
    padding: 2rem 0;
    border-top: 1px solid var(--divider-color);
    text-align: center;
}

.footer p {
    font-size: 0.9rem;
    margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .stack-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    #nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: rgba(17, 17, 17, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        border-bottom: 1px solid var(--divider-color);
    }

    #nav-menu.active {
        display: flex;
    }

    #nav-menu a {
        padding: 1.5rem 2rem;
        border-top: 1px solid var(--divider-color);
    }

    #nav-menu a::after {
        display: none;
    }

    #nav-menu a:hover {
        background-color: var(--hover-bg);
        color: var(--text-primary);
    }

    .nav-contact-btn {
        border: none;
        border-top: 1px solid var(--divider-color);
        padding: 1.5rem 2rem !important;
    }

    .nav-contact-btn:hover {
        background-color: var(--accent-color);
        color: #111 !important;
    }

    .header-actions {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-card {
        padding: 3rem 1.5rem;
    }
    
    .contact-title {
        font-size: 1.5rem;
    }
}