/* --- MONOCHROME DARK THEME (CHARCOAL & GRAY) --- */
:root {
    --bg-dark: #121212;
    --bg-surface: #1c1c1c;
    --bg-surface-hover: #242424;
    --border-color: #2e2e2e;
    --border-color-hover: #4a4a4a;
    
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --text-muted: #787878;
    
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-code: 'JetBrains Mono', monospace;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --transition: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* NAVIGATION */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: rgba(18, 18, 18, 0.95);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12%;
    z-index: 1000;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.3px;
}

.logo-text span {
    color: var(--text-muted);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

/* MAIN CONTAINER & SECTIONS */
.content-container {
    flex: 1;
    max-width: 760px;
    width: 100%;
    margin-top: 64px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 40px;
    padding: 60px 20px 40px 20px;
}

.page-section {
    display: none;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.page-section.active {
    display: block;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* SECTION HEADERS */
.section-header {
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

/* 1. HOME SECTION */
.home-text-space {
    padding: 0;
}

.greeting-tag {
    font-family: var(--font-code);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.main-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -1.2px;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.headline-text {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 2rem;
    font-weight: 400;
}

.headline-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

.home-actions {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-dark);
    border: 1px solid var(--text-primary);
}

.btn-primary:hover {
    background: #e5e5e5;
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* 2. ABOUT ME SECTION & TIMELINE */
.about-intro {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2.5rem;
}

.about-intro strong {
    color: var(--text-primary);
}

.timeline-container {
    margin-top: 1.5rem;
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.timeline {
    position: relative;
    padding-left: 1.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 6px;
    bottom: 6px;
    left: 5px;
    width: 1px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -1.5rem;
    top: 6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 2px solid var(--text-secondary);
}

.timeline-item:hover .timeline-dot {
    border-color: var(--text-primary);
    background: var(--text-primary);
}

.timeline-content {
    padding-left: 0.5rem;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.timeline-heading {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-date {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.timeline-sub {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.timeline-location {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.timeline-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
    font-family: var(--font-code);
}

/* 3. PROJECTS SECTION */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    transition: var(--transition);
}

.project-item:hover {
    border-color: var(--border-color-hover);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.project-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.project-links a:hover {
    color: var(--text-primary);
}

.project-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.project-tech {
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 4. CONTACT SECTION */
.contact-intro {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    border-top: 1px solid var(--border-color);
}

.contact-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.contact-type {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
}

.contact-link,
.contact-obfuscated {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-code);
    transition: var(--transition);
}

.contact-obfuscated {
    cursor: pointer;
    user-select: all;
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    border: 1px dashed var(--border-color);
}

.contact-obfuscated:hover {
    border-color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.08);
}

.contact-link:hover {
    color: #e5e5e5;
    text-decoration: underline;
}

/* FOOTER */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 1.75rem 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
}

.footer-container {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--text-primary);
}

.footer-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
    flex-shrink: 0;
    transition: var(--transition);
}

/* RESPONSIVE DESIGN */
@media (max-width: 640px) {
    .navbar {
        height: auto;
        padding: 12px 16px;
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }
    
    .nav-links {
        gap: 1.25rem;
    }
    
    .nav-link {
        font-size: 0.85rem;
    }

    .content-container {
        margin-top: 85px;
        padding: 30px 16px 40px 16px;
    }
    
    .main-title {
        font-size: 2.2rem;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: 0.2rem;
    }
    
    .contact-list-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }

    .footer-container {
        flex-direction: column;
        justify-content: center;
        text-align: center;
        gap: 0.75rem;
    }
}