/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161e;
    --bg-card-hover: #1c1c26;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-dark: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --accent-2: #06b6d4;
    --accent-3: #8b5cf6;
    --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --nav-height: 70px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent);
    color: white;
}

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

ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Cursor Glow ===== */
.cursor-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: opacity 0.3s;
    opacity: 0;
}

body:hover .cursor-glow { opacity: 1; }

/* ===== Particle Canvas ===== */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    transition: var(--transition);
    backdrop-filter: blur(0px);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    display: flex;
    gap: 2px;
    z-index: 1001;
}

.nav-logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.logo-bracket { color: var(--accent); }
.logo-text { color: var(--text-primary); }

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: calc(var(--nav-height) + 40px) 24px 40px;
}

.hero-content {
    max-width: 1200px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.greeting-line {
    width: 40px;
    height: 2px;
    background: var(--accent);
}

.typing-text {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--accent-light);
    letter-spacing: 0.05em;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 12px;
}

.name-line {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.hero-title {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 24px;
    min-height: 2.4em;
}

.title-static { color: var(--text-secondary); }

.title-dynamic {
    color: var(--accent-light);
    font-family: var(--font-mono);
}

.title-cursor {
    animation: blink 1s infinite;
    color: var(--accent);
    font-weight: 300;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-main);
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--accent-light);
    border: 1.5px solid var(--accent);
}

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

.hero-social {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: var(--transition);
}

.social-link:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: var(--accent-glow);
    transform: translateY(-3px);
}

/* Code Window */
.code-window {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform 0.5s ease;
}

.code-window:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
}

.code-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #22c55e; }

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

.code-body {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.9;
    overflow-x: auto;
}

.code-body code {
    font-family: inherit;
}

.code-keyword { color: #c084fc; }
.code-class { color: #22d3ee; }
.code-string { color: #34d399; }
.code-method { color: #fbbf24; }

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    animation: float 3s ease-in-out infinite;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.mouse-wheel {
    width: 3px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll-wheel {
    0%, 100% { opacity: 1; top: 8px; }
    50% { opacity: 0.3; top: 18px; }
}

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

/* ===== Section Common ===== */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 60px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.title-number {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
}

.section-title::after {
    content: '';
    flex: 1;
    max-width: 300px;
    height: 1px;
    background: var(--border);
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 60px;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
}

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

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    max-width: 350px;
    margin: 0 auto;
}

.profile-photo {
    width: 100%;
    height: 100%;
    border-radius: 20px;
    object-fit: cover;
    position: relative;
    z-index: 1;
    filter: grayscale(20%) contrast(1.05);
    transition: var(--transition);
}

.image-wrapper:hover .profile-photo {
    filter: grayscale(0%) contrast(1.1);
    transform: scale(1.02);
}

.image-border {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100%;
    height: 100%;
    border-radius: 20px;
    border: 2px solid var(--accent);
    opacity: 0.3;
    transition: var(--transition);
}

.image-wrapper:hover .image-border {
    top: 12px;
    left: 12px;
    opacity: 0.5;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.category-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--accent-light);
    margin-bottom: 20px;
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    background: rgba(99, 102, 241, 0.08);
    color: var(--accent-light);
    border: 1px solid rgba(99, 102, 241, 0.15);
    transition: var(--transition);
}

.skill-tag:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--accent);
    transform: translateY(-1px);
}

/* ===== Experience ===== */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), transparent);
}

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

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

.timeline-marker {
    position: absolute;
    left: -40px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 3px solid var(--accent);
    z-index: 1;
    transition: var(--transition);
}

.timeline-item:hover .timeline-marker {
    background: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--border-hover);
    transform: translateX(8px);
}

.timeline-header {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.timeline-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

.timeline-company {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent-light);
}

.timeline-date {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.timeline-details li {
    position: relative;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 0.925rem;
    margin-bottom: 8px;
}

.timeline-details li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-family: var(--font-mono);
    font-weight: 700;
}

.timeline-project {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-2);
    margin-bottom: 12px;
    font-family: var(--font-mono);
}

.timeline-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.timeline-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-2);
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(6, 182, 212, 0.08);
}

/* ===== Projects ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.project-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
    font-size: 3rem;
    color: var(--accent);
    opacity: 0.5;
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 15, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay { opacity: 1; }

.project-links {
    display: flex;
    gap: 16px;
}

.project-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: var(--transition);
    transform: translateY(10px);
}

.project-card:hover .project-link { transform: translateY(0); }

.project-link:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: var(--accent-glow);
}

.project-info {
    padding: 24px;
}

.project-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-2);
    padding: 3px 10px;
    border-radius: 20px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    margin-bottom: 10px;
}

.project-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.project-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-2);
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(6, 182, 212, 0.08);
}

.subsection-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin: 60px 0 30px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.subsection-title::before {
    content: '//';
    font-family: var(--font-mono);
    color: var(--accent);
    font-weight: 500;
}

/* ===== Contact ===== */
.contact-content {
    max-width: 650px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-form {
    text-align: left;
    margin-bottom: 40px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    position: relative;
    margin-bottom: 24px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 0 8px;
    font-size: 1rem;
    font-family: var(--font-main);
    color: var(--text-primary);
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border);
    outline: none;
    transition: var(--transition);
    resize: vertical;
}

.form-group label {
    position: absolute;
    left: 0;
    top: 16px;
    font-size: 0.95rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: var(--transition);
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: -4px;
    font-size: 0.75rem;
    color: var(--accent-light);
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: var(--transition);
}

.form-group input:focus ~ .form-line,
.form-group textarea:focus ~ .form-line {
    width: 100%;
}

.btn-submit {
    width: 100%;
    justify-content: center;
    padding: 16px;
    font-size: 1rem;
}

.contact-alternatives {
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.contact-alternatives > p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--accent-light);
}

.contact-link i {
    color: var(--accent);
}

/* ===== Footer ===== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-content {
    text-align: center;
}

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

.footer-content strong { color: var(--text-secondary); }

.footer-sub {
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

/* ===== Animations (AOS alternative) ===== */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-greeting { justify-content: center; }
    .hero-description { margin: 0 auto 32px; }
    .hero-cta { justify-content: center; }
    .hero-social { justify-content: center; }

    .code-window {
        transform: none;
        max-width: 500px;
        margin: 0 auto;
    }

    .code-window:hover { transform: none; }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-image { order: -1; }

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

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        padding: 40px;
        gap: 4px;
        transition: right 0.4s ease;
        border-left: 1px solid var(--border);
    }

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

    .nav-link {
        font-size: 1.1rem;
        padding: 12px 16px;
    }

    .nav-toggle { display: flex; }

    .nav-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .nav-toggle.open span:nth-child(2) { opacity: 0; }
    .nav-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .form-row { grid-template-columns: 1fr; }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .stat-number { font-size: 2rem; }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn { width: 100%; justify-content: center; }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .section { padding: 70px 0; }
    .section-title { font-size: 1.5rem; margin-bottom: 40px; }
    .code-body { font-size: 0.75rem; padding: 16px; }
}