/* Base Styles & Custom Properties */
:root {
    /* Minimal Engineering Aesthetic */
    --bg-primary: #0f1115; 
    --bg-secondary: #1a1d24;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --border-color: #2e3646;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --max-width: 1000px;
    --nav-height: 80px;
    --transition: 0.2s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

ul { list-style: none; }
img, svg { max-width: 100%; display: block; }
h1, h2, h3, h4 { color: var(--text-primary); line-height: 1.2; font-weight: 600; }

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.9rem;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}
.btn-primary { background-color: var(--accent); color: var(--bg-primary); border: 1px solid var(--accent); }
.btn-primary:hover { background-color: transparent; color: var(--accent); }
.btn-outline { background-color: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background-color: var(--accent); color: var(--bg-primary); }

/* Navigation */
.navbar {
    position: fixed;
    top: 0; left: 0; width: 100%; height: var(--nav-height);
    background-color: rgba(15, 17, 21, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}
.nav-container {
    display: flex; justify-content: space-between; align-items: center;
    height: 100%; width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 2rem;
}
.brand { font-size: 1.5rem; font-weight: 700; color: var(--accent); font-family: var(--font-mono); }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-link { font-size: 0.9rem; color: var(--text-secondary); font-family: var(--font-mono); }
.nav-link:hover, .nav-link.active { color: var(--accent); }
.nav-resume { padding: 0.5rem 1rem; font-size: 0.85rem; }
.mobile-menu-btn {
    display: none; background: transparent; border: none; cursor: pointer;
    flex-direction: column; gap: 5px; padding: 0.5rem;
}
.mobile-menu-btn .bar { width: 25px; height: 2px; background-color: var(--text-primary); transition: all var(--transition); }

/* Hero */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; padding-top: var(--nav-height);
}
.hero-container {
    display: flex; align-items: center; gap: 4rem; justify-content: space-between;
}
.hero-content { flex: 1; }
.hero-greeting { color: var(--accent); font-family: var(--font-mono); margin-bottom: 1rem; }
.hero-title { font-size: clamp(2.5rem, 6vw, 4.5rem); margin-bottom: 0.5rem; }
.hero-subtitle { font-size: clamp(1.5rem, 4vw, 3rem); color: var(--text-secondary); margin-bottom: 1.5rem; }
.hero-description { color: var(--text-secondary); font-size: 1.1rem; max-width: 540px; margin-bottom: 2.5rem; }
.hero-actions { display: flex; gap: 1rem; margin-bottom: 2.5rem; }
.hero-socials { display: flex; gap: 1.5rem; }
.hero-socials a { color: var(--text-secondary); width: 22px; height: 22px; display: inline-block; }
.hero-socials a:hover { color: var(--accent); transform: translateY(-2px); }

.hero-image-wrapper {
    flex-shrink: 0;
    width: 300px;
    height: 300px;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
}
.hero-image {
    width: 100%; height: 100%; object-fit: cover;
    filter: grayscale(20%) contrast(1.1);
}

/* About */
.about-text p { color: var(--text-secondary); margin-bottom: 1.5rem; max-width: 700px; }

/* Projects */
.projects-grid { display: flex; flex-direction: column; gap: 4rem; }
.project-card {
    display: flex; flex-direction: column; gap: 1.5rem;
    padding: 2rem; border: 1px solid var(--border-color);
    background-color: var(--bg-secondary); border-radius: 6px;
}
.project-header { display: flex; justify-content: space-between; align-items: flex-start; }
.project-title { font-size: 1.5rem; margin-bottom: 0.5rem; }
.project-date { font-family: var(--font-mono); color: var(--accent); font-size: 0.9rem; }
.project-role { color: var(--text-primary); font-weight: 500; font-size: 0.95rem; margin-bottom: 1rem; }
.project-desc { color: var(--text-secondary); margin-bottom: 1.5rem; }
.project-tech {
    display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.5rem;
    font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-secondary);
}
.project-actions { display: flex; gap: 1rem; align-items: center; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 2rem; }
.skill-category h3 { font-size: 1.1rem; margin-bottom: 1rem; color: var(--text-primary); }
.skill-list { color: var(--text-secondary); font-family: var(--font-mono); font-size: 0.9rem; }
.skill-list li { margin-bottom: 0.5rem; position: relative; padding-left: 1.25rem; }
.skill-list li::before { content: '▹'; position: absolute; left: 0; color: var(--accent); }

/* Coding */
.coding-content { background-color: var(--bg-secondary); padding: 2rem; border-radius: 6px; border: 1px solid var(--border-color); }
.coding-description { color: var(--text-secondary); margin-bottom: 2rem; }
.coding-links { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Timeline (Journey & Education) */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}
.timeline::before {
    content: ''; position: absolute; left: 0; top: 0; height: 100%; width: 1px; background-color: var(--border-color);
}
.timeline-item { position: relative; padding-left: 2rem; margin-bottom: 2.5rem; }
.timeline-item::before {
    content: ''; position: absolute; left: -4px; top: 6px; width: 9px; height: 9px;
    background-color: var(--bg-primary); border: 2px solid var(--accent); border-radius: 50%;
}
.timeline-year { font-family: var(--font-mono); color: var(--accent); font-size: 0.9rem; margin-bottom: 0.25rem; }
.timeline-title { font-size: 1.1rem; color: var(--text-primary); font-weight: 600; }
.timeline-subtitle { color: var(--text-secondary); font-size: 0.95rem; }
.timeline-detail { color: var(--text-secondary); font-size: 0.85rem; font-family: var(--font-mono); margin-top: 0.25rem; }

/* Contact */
.contact-content { max-width: 600px; margin: 0 auto; }
.contact-overline { color: var(--accent); font-family: var(--font-mono); margin-bottom: 1rem; }
.contact-title { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 1.5rem; }
.contact-description { color: var(--text-secondary); margin-bottom: 2.5rem; }
.contact-actions { display: flex; gap: 1rem; justify-content: center; }

/* Footer */
.footer { padding: 2rem 0; text-align: center; border-top: 1px solid var(--border-color); }
.footer-text { color: var(--text-secondary); font-family: var(--font-mono); font-size: 0.85rem; }

/* Modal for Project Evidence */
.modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(15, 17, 21, 0.95); z-index: 1000;
    overflow-y: auto; padding: 2rem 1rem;
    align-items: flex-start; justify-content: center;
}
.modal.open { display: flex; }
.modal-content {
    background-color: var(--bg-primary);
    width: 100%; max-width: 800px;
    border-radius: 6px; border: 1px solid var(--border-color);
    position: relative; padding: 3rem 2rem;
    margin: auto;
}
.modal-close {
    position: absolute; top: 1rem; right: 1rem;
    background: none; border: none; color: var(--text-secondary);
    font-size: 2rem; cursor: pointer; line-height: 1;
}
.modal-close:hover { color: var(--accent); }

.modal-header { margin-bottom: 2rem; }
.modal-title { font-size: 2rem; margin-bottom: 0.5rem; }
.modal-role { color: var(--accent); font-family: var(--font-mono); font-size: 0.95rem; }
.modal-section { margin-bottom: 2rem; }
.modal-section h4 { font-size: 1.1rem; margin-bottom: 0.75rem; color: var(--text-primary); border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
.modal-section p { color: var(--text-secondary); font-size: 0.95rem; }

.evidence-box {
    background-color: var(--bg-secondary); border: 1px dashed var(--border-color);
    border-radius: 4px; padding: 2rem; text-align: center; color: var(--text-secondary);
}
.evidence-video-container {
    position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: 4px;
}
.evidence-video-container iframe, .evidence-video-container video {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
}

/* Responsive */
@media (max-width: 768px) {
    .mobile-menu-btn { display: flex; }
    .nav-links {
        position: fixed; top: var(--nav-height); right: -100%;
        width: 100%; height: calc(100vh - var(--nav-height));
        background-color: var(--bg-primary); flex-direction: column;
        justify-content: center; transition: right var(--transition);
    }
    .nav-links.nav-open { right: 0; }
    .hero-container { flex-direction: column-reverse; text-align: center; gap: 2rem; }
    .hero-description { margin: 0 auto 2.5rem auto; }
    .hero-actions { justify-content: center; flex-direction: column; }
    .hero-socials { justify-content: center; }
    .contact-actions { flex-direction: column; }
    .modal-content { padding: 2rem 1.5rem; }
}