/* ============================================
   CSS Custom Properties - Professional Theme
   ============================================ */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-surface: #334155;
    --bg-card: #1e293b;

    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-subtle: rgba(59, 130, 246, 0.1);
    --accent-border: rgba(59, 130, 246, 0.25);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: rgba(148, 163, 184, 0.1);

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   Background
   ============================================ */
#particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--bg-primary);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 0.875rem 0;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-normal);
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(16px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-links {
    list-style: none;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.mobile-nav-links li {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.mobile-menu.active .mobile-nav-links li {
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu.active .mobile-nav-links li:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.active .mobile-nav-links li:nth-child(2) { transition-delay: 0.15s; }
.mobile-menu.active .mobile-nav-links li:nth-child(3) { transition-delay: 0.2s; }
.mobile-menu.active .mobile-nav-links li:nth-child(4) { transition-delay: 0.25s; }
.mobile-menu.active .mobile-nav-links li:nth-child(5) { transition-delay: 0.3s; }

.mobile-nav-links a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

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

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    text-align: center;
    padding: 7rem 2rem 2rem;
}

.hero-content {
    z-index: 1;
    max-width: 640px;
}

.hero-image-wrapper {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto 2rem;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    border-radius: 50%;
    border: 3px solid var(--bg-surface);
}

.hero-image-glow {
    display: none;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.hero-title .greeting,
.hero-title .cursor {
    display: none;
}

.hero-title .name {
    background: none;
    -webkit-text-fill-color: var(--text-primary);
    font-weight: 700;
}

.hero-role {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 1.25rem;
}

.hero-tagline {
    display: none;
}

.hero-summary {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.75rem;
}

.hero-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.hero-location {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    background: none;
    padding: 0;
    border: none;
    border-radius: 0;
}

.location-icon {
    width: 15px;
    height: 15px;
    color: var(--text-muted);
}

.hero-linkedin {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 500;
    transition: var(--transition-fast);
}

.hero-linkedin:hover {
    color: var(--accent-hover);
}

.hero-linkedin svg {
    width: 16px;
    height: 16px;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    animation: bounce 2.5s infinite;
}

.scroll-text {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.scroll-arrow svg {
    width: 20px;
    height: 20px;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: 5rem 0;
    position: relative;
}

.section-title {
    font-size: clamp(1.375rem, 3vw, 1.75rem);
    font-weight: 700;
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: -0.025em;
}

.title-number {
    font-family: 'Inter', monospace;
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 600;
}

/* ============================================
   About Section
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}

@media (min-width: 768px) {
    .about-content {
        grid-template-columns: 2fr 1fr;
    }
}

.about-text p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.about-intro {
    font-size: 1.1rem !important;
    color: var(--text-primary) !important;
}

.highlight {
    color: var(--accent);
    font-weight: 600;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition-normal);
}

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

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    font-size: 0.825rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ============================================
   Projects Section
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-card);
    padding: 1.75rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    display: block;
    position: relative;
}

.project-card::before {
    display: none;
}

.project-card:hover {
    border-color: var(--accent-border);
    transform: translateY(-4px);
}

.project-card > * {
    position: relative;
    z-index: 1;
}

.project-icon {
    width: 52px;
    height: 52px;
    background: var(--accent-subtle);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.project-icon svg {
    width: 26px;
    height: 26px;
    color: var(--accent);
}

.project-icon-img {
    background: transparent;
    overflow: hidden;
    padding: 0;
}

.project-icon-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.project-card:hover .project-icon:not(.project-icon-img) {
    background: var(--accent-subtle);
}

.project-card:hover .project-icon svg {
    color: var(--accent);
}

.project-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.625rem;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.project-tags span {
    padding: 0.25rem 0.625rem;
    background: var(--bg-surface);
    border-radius: 5px;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--accent);
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.project-link svg {
    width: 14px;
    height: 14px;
    transition: var(--transition-fast);
}

.project-card:hover .project-link svg {
    transform: translate(2px, -2px);
}

.project-card-coming-soon {
    border-style: dashed;
    opacity: 0.6;
    cursor: default;
}

.project-card-coming-soon:hover {
    transform: none;
}

/* ============================================
   Skills Section
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background: var(--bg-card);
    padding: 1.75rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

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

.skill-icon {
    width: 44px;
    height: 44px;
    background: var(--accent-subtle);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.skill-icon svg {
    width: 22px;
    height: 22px;
    color: var(--accent);
}

.skill-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.skill-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.skill-bar {
    height: 4px;
    background: var(--bg-surface);
    border-radius: 2px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    width: 0;
    transition: width 1.2s ease-out;
}

/* ============================================
   Tech Stack Section
   ============================================ */
.techstack-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.techstack-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: var(--transition-normal);
}

.techstack-category:hover {
    border-color: var(--accent-border);
}

.techstack-category-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 1rem;
}

.techstack-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
}

.techstack-item {
    padding: 0.5rem 1rem;
    background: var(--bg-surface);
    border-radius: 6px;
}

.techstack-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    text-align: center;
}

.contact-content {
    max-width: 520px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.875rem 1.75rem;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: var(--transition-normal);
}

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

.linkedin-icon {
    width: 18px;
    height: 18px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.375rem;
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

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

.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* ============================================
   Journey Timeline
   ============================================ */
.journey-section {
    margin-top: 3.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border-color);
}

.journey-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--bg-surface);
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
    padding-left: 1.5rem;
}

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

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--bg-primary);
    border: 3px solid var(--accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    padding: 1.25rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.timeline-item:hover .timeline-content {
    border-color: var(--accent-border);
}

.timeline-year {
    display: inline-block;
    padding: 0.2rem 0.625rem;
    background: var(--accent-subtle);
    color: var(--accent);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.625rem;
}

.timeline-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
    color: var(--text-primary);
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* ============================================
   Section Subtitle
   ============================================ */
.section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: -1.5rem;
    margin-bottom: 2.5rem;
    max-width: 560px;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .logo-text {
        font-size: 1rem;
    }

    .hero {
        padding: 5rem 1.5rem 2rem;
    }

    .hero-image-wrapper {
        width: 170px;
        height: 170px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .section {
        padding: 3.5rem 0;
    }

    .container {
        padding: 0 1.5rem;
    }

    .section-title {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.375rem;
    }

    .hero-meta {
        flex-direction: column;
        gap: 0.75rem;
    }

    .about-stats {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .stat-card {
        flex: 1;
        min-width: 100px;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline::before {
        left: 4px;
    }

    .timeline-marker {
        left: -1.5rem;
        width: 12px;
        height: 12px;
    }

    .hobby-featured {
        padding: 1.75rem;
    }

    .hobby-featured-bg {
        display: none;
    }

    .hobby-featured-content h3 {
        font-size: 1.2rem;
    }

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

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .hero-image-wrapper {
        width: 150px;
        height: 150px;
    }
}

/* ============================================
   Selection & Scrollbar
   ============================================ */
::selection {
    background: var(--accent);
    color: #fff;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-surface);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}