/* ----------------------------------
   Core Variables & Setup (Light Theme)
----------------------------------- */
:root {
    /* Bright, clean backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    /* High contrast text */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    
    /* Tech Blue Accents */
    --accent-primary: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #eff6ff;
    
    /* Borders */
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, Menlo, monospace;
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ----------------------------------
   Typography & Layout
----------------------------------- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--border);
}

.section:last-of-type {
    border-bottom: none;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
}

/* ----------------------------------
   Navigation
----------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--accent-primary);
    letter-spacing: -0.05em;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.btn-outline {
    border: 1px solid var(--border-hover);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ----------------------------------
   Hero Section (Dynamic)
----------------------------------- */
.hero {
    position: relative;
    padding: 12rem 0 7rem;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}

/* Subtle Dynamic Background */
.hero-background {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at 15% 50%, rgba(37, 99, 235, 0.08), transparent 25%),
                radial-gradient(circle at 85% 30%, rgba(37, 99, 235, 0.05), transparent 25%);
    z-index: -1;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-text {
    max-width: 650px;
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
    transition: transform 0.2s, background 0.2s;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* ----------------------------------
   Bento Grid (Projects)
----------------------------------- */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.highlight-card {
    grid-column: 1 / -1; 
}

.bento-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
    transition: box-shadow 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.bento-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.bento-card h4 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

.repo-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-decoration: none;
}
.repo-link:hover { text-decoration: underline; }

.repo-icon {
    color: var(--text-tertiary);
    transition: color 0.2s;
}
.repo-icon:hover { color: var(--accent-primary); }

.status {
    display: inline-block;
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-primary);
    background: var(--accent-light);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-weight: 600;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    flex-grow: 1;
}

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

.tech-stack span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.tech-stack .tag-blue {
    background: var(--accent-light);
    color: var(--accent-primary);
    border-color: rgba(37, 99, 235, 0.2);
    font-weight: 500;
}

/* ----------------------------------
   Timeline (Experience & Education)
----------------------------------- */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
}

.timeline-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.timeline-meta .date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-tertiary);
}

.status-badge {
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-weight: 600;
}

.award-badge {
    background: #fef3c7;
    color: #d97706;
    border: 1px solid #fde68a;
}

.timeline-content h4 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.timeline-content h5 {
    font-size: 0.95rem;
    color: var(--accent-primary);
    font-weight: 500;
    margin-bottom: 1rem;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ----------------------------------
   Skills
----------------------------------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.skill-category h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.skill-category p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ----------------------------------
   Footer & Animations
----------------------------------- */
footer {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .timeline-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .nav-links {
        display: none; 
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
}