/* ===== CSS Variables ===== */
:root {
    --bg: #0a0a0a;
    --surface: #111827;
    --surface-alt: #1f2937;
    --text: #f3f4f6;
    --text-muted: #9ca3af;
    --accent: #00d4aa;
    --accent-hover: #00b894;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 0.3s ease;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

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

ul {
    list-style: none;
}

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

/* ===== Utility ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

.section-alt {
    background: var(--surface);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* ===== Fade-in Animation ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    padding: 10px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: transform var(--transition), opacity var(--transition);
}

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

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

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

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(0, 212, 170, 0.08) 1px, transparent 0);
    background-size: 40px 40px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(40px, 40px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 0 24px;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 8px;
    font-family: var(--font-mono);
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.hero-title {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 212, 170, 0.3);
}

.btn-outline {
    border-color: var(--accent);
    color: var(--accent);
    background: transparent;
}

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

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { top: 6px; opacity: 1; }
    50% { top: 18px; opacity: 0.3; }
}

/* ===== About ===== */
.about-content {
    max-width: 800px;
    margin: 0 auto 48px;
    text-align: center;
}

.about-text {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.8;
}

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

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--surface-alt);
    border-radius: 12px;
    padding: 32px 20px;
    text-align: center;
    transition: transform var(--transition), border-color var(--transition);
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-mono);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.skill-category {
    background: var(--bg);
    border: 1px solid var(--surface-alt);
    border-radius: 12px;
    padding: 24px;
}

.skill-category-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--accent);
    font-family: var(--font-mono);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    background: var(--surface-alt);
    color: var(--text);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    transition: background var(--transition), color var(--transition), transform var(--transition);
    border: 1px solid transparent;
}

.skill-tag:hover {
    background: rgba(0, 212, 170, 0.1);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

/* ===== Experience / Timeline ===== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--surface-alt);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -33px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg);
    z-index: 1;
}

.timeline-content {
    background: var(--surface);
    border: 1px solid var(--surface-alt);
    border-radius: 12px;
    padding: 28px;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 4px;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-company {
    font-size: 1.25rem;
    font-weight: 700;
}

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

.timeline-role {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.timeline-role-date {
    font-size: 0.8rem;
    color: var(--accent);
    font-family: var(--font-mono);
}

.timeline-location {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.timeline-role-group {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--surface-alt);
}

.timeline-projects {
    margin-top: 12px;
}

.timeline-project {
    margin-bottom: 16px;
}

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

.timeline-project h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 6px;
}

.timeline-project ul {
    list-style: disc;
    padding-left: 20px;
}

.timeline-project li {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    line-height: 1.6;
}

/* ===== Projects ===== */
.filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--surface-alt);
    color: var(--text-muted);
    padding: 8px 20px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg);
    border: 1px solid var(--surface-alt);
    border-radius: 12px;
    padding: 28px;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(0, 212, 170, 0.1);
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.project-card-title {
    font-size: 1.1rem;
    font-weight: 700;
}

.project-card-category {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    color: var(--accent);
    background: rgba(0, 212, 170, 0.1);
    padding: 4px 10px;
    border-radius: 4px;
    white-space: nowrap;
}

.project-card-description {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

.project-card-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    margin-bottom: 12px;
}

.project-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.project-tag {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: var(--surface-alt);
    padding: 3px 10px;
    border-radius: 4px;
}

.project-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    transition: gap var(--transition);
}

.project-card-link:hover {
    gap: 10px;
}

/* ===== Blog ===== */
.blog-grid {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    gap: 24px;
}

.blog-card {
    background: var(--surface);
    border: 1px solid var(--surface-alt);
    border-radius: 12px;
    padding: 28px;
    transition: transform var(--transition), border-color var(--transition);
    display: block;
}

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

.blog-card-date {
    font-size: 0.8rem;
    color: var(--accent);
    font-family: var(--font-mono);
    margin-bottom: 8px;
}

.blog-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.blog-card-description {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 12px;
}

.blog-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.blog-tag {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: var(--surface-alt);
    padding: 3px 10px;
    border-radius: 4px;
}

.blog-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    transition: gap var(--transition);
}

.blog-card-link:hover {
    gap: 10px;
}

/* ===== Contact ===== */
.contact-intro {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 500px;
    margin: 0 auto 40px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--bg);
    border: 1px solid var(--surface-alt);
    border-radius: 12px;
    padding: 28px 20px;
    text-align: center;
    transition: transform var(--transition), border-color var(--transition);
    display: block;
}

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

.contact-icon {
    color: var(--accent);
    margin-bottom: 12px;
}

.contact-icon svg {
    margin: 0 auto;
}

.contact-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.contact-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    word-break: break-word;
}

/* ===== Footer ===== */
.footer {
    border-top: 1px solid var(--surface-alt);
    padding: 32px 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.footer-nav {
    display: flex;
    gap: 24px;
}

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

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

.back-to-top {
    width: 40px;
    height: 40px;
    border: 1px solid var(--surface-alt);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all var(--transition);
}

.back-to-top:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

    .section-title {
        font-size: 1.6rem;
        margin-bottom: 32px;
    }

    /* Mobile Nav */
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--surface);
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 24px;
        transition: right var(--transition);
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-link {
        font-size: 1.1rem;
    }

    /* Mobile Sections */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-card {
        padding: 20px 16px;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-marker {
        left: -27px;
        width: 12px;
        height: 12px;
    }

    .timeline-content {
        padding: 20px;
    }

    .timeline-header {
        flex-direction: column;
    }

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

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

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .contact-wrapper {
        flex-direction: column;
    }

    .contact-form {
        max-width: 100%;
    }

    .form-row {
        flex-direction: column;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }
}

/* ===== Contact Form ===== */
.contact-wrapper {
    display: flex;
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
    align-items: flex-start;
}

.contact-form {
    flex: 1;
    min-width: 0;
}

.contact-info {
    display: grid;
    gap: 16px;
    width: 280px;
    flex-shrink: 0;
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .form-group {
    flex: 1;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg);
    border: 1px solid var(--surface-alt);
    border-radius: 8px;
    color: var(--text);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: border-color var(--transition);
    resize: vertical;
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.5;
}

.contact-status {
    font-size: 0.85rem;
    margin-bottom: 12px;
    min-height: 20px;
}

.contact-status.success {
    color: var(--accent);
}

.contact-status.error {
    color: #ef4444;
}

/* ===== Blog Post Page ===== */
.blog-post {
    max-width: 800px;
    margin: 0 auto;
    padding: 120px 24px 80px;
}

.blog-post-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: 32px;
    transition: gap var(--transition);
}

.blog-post-back:hover {
    gap: 10px;
}

.blog-post-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
}

.blog-post-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.blog-post-date {
    font-size: 0.85rem;
    color: var(--accent);
    font-family: var(--font-mono);
}

.blog-post-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.blog-post-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-muted);
}

.blog-post-content h1,
.blog-post-content h2,
.blog-post-content h3,
.blog-post-content h4 {
    color: var(--text);
    margin: 32px 0 16px;
    line-height: 1.3;
}

.blog-post-content h2 {
    font-size: 1.5rem;
}

.blog-post-content h3 {
    font-size: 1.25rem;
}

.blog-post-content p {
    margin-bottom: 16px;
}

.blog-post-content a {
    color: var(--accent);
    text-decoration: underline;
}

.blog-post-content code {
    background: var(--surface-alt);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.blog-post-content pre {
    background: var(--surface);
    border: 1px solid var(--surface-alt);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin-bottom: 20px;
}

.blog-post-content pre code {
    background: none;
    padding: 0;
}

.blog-post-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 16px;
    margin: 20px 0;
    color: var(--text-muted);
    font-style: italic;
}

.blog-post-content ul,
.blog-post-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
    list-style: disc;
}

.blog-post-content ol {
    list-style: decimal;
}

.blog-post-content li {
    margin-bottom: 8px;
}

.blog-post-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 20px 0;
}