/* ===== CSS Variables ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #0ea5e9;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 40px -5px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ===== Language Overlay ===== */
.lang-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 10000;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}
.lang-overlay.active { opacity: 1; visibility: visible; }
.lang-modal {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: transform 0.4s ease;
    max-width: 420px;
    width: 90%;
}
.lang-overlay.active .lang-modal { transform: translateY(0); }
.lang-modal h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 28px;
    color: var(--text);
}
.lang-options { display: flex; flex-direction: column; gap: 12px; }
.lang-option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 24px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    cursor: pointer;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    transition: all var(--transition);
}
.lang-option:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.04);
    transform: translateX(4px);
}
.lang-flag { font-size: 1.6rem; }
.lang-name { font-weight: 500; }

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}
.navbar.scrolled { border-bottom-color: var(--border); box-shadow: var(--shadow-sm); }
.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.nav-logo { font-size: 1.5rem; font-weight: 700; color: var(--text); letter-spacing: -0.5px; }
.nav-logo span { color: var(--primary); }
.nav-center { flex: 1; display: flex; justify-content: center; }
.nav-menu { display: flex; list-style: none; gap: 8px; }
.nav-menu a {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: all var(--transition);
}
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); background: rgba(37,99,235,0.06); }
.nav-right { display: flex; align-items: center; gap: 12px; }

/* Language Switcher */
.lang-switcher { position: relative; }
.lang-current {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    transition: all var(--transition);
}
.lang-current:hover { border-color: var(--primary); }
.lang-current i { font-size: 0.65rem; color: var(--text-muted); transition: transform var(--transition); }
.lang-flag-small { font-size: 1rem; }
.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition);
    min-width: 160px;
    z-index: 100;
}
.lang-dropdown.active { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-dropdown button {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: none;
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.9rem;
    color: var(--text);
    transition: background var(--transition);
}
.lang-dropdown button:hover { background: var(--bg-alt); }
.lang-dropdown button span { font-size: 1.1rem; }

/* Nav Toggle (Mobile) */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-alt) 50%, rgba(37,99,235,0.03) 100%);
}
.hero-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(37,99,235,0.08);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 20px;
    font-family: var(--font-mono);
}
.hero-title { margin-bottom: 20px; }
.greeting {
    display: block;
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.name {
    display: block;
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -1.5px;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 28px;
    max-width: 520px;
}
.hero-description strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; gap: 12px; margin-bottom: 32px; flex-wrap: wrap; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 10px;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font);
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.4);
}
.btn-outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(37,99,235,0.04);
}

/* Hero Social */
.hero-social { display: flex; gap: 12px; }
.hero-social a {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 10px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all var(--transition);
}
.hero-social a:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(37,99,235,0.06);
    transform: translateY(-2px);
}

/* Hero Image */
.hero-image { display: flex; flex-direction: column; align-items: center; gap: 32px; }
.hero-image-wrapper { position: relative; width: 320px; height: 320px; }
.hero-image-wrapper img {
    width: 100%; height: 100%;
    object-fit: cover;
    border-radius: 50%;
    position: relative;
    z-index: 2;
}
.hero-image-ring {
    position: absolute;
    top: -8px; left: -8px; right: -8px; bottom: -8px;
    border-radius: 50%;
    border: 3px solid var(--primary);
    opacity: 0.3;
    animation: ringPulse 3s ease-in-out infinite;
}
@keyframes ringPulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.15; transform: scale(1.03); }
}

/* Hero Stats */
.hero-stats {
    display: flex;
    gap: 32px;
    padding: 20px 32px;
    background: var(--bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.stat-item { text-align: center; }
.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    font-family: var(--font-mono);
}
.stat-suffix { font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.stat-label { display: block; font-size: 0.75rem; color: var(--text-muted); font-weight: 500; margin-top: 2px; }

/* ===== Sections ===== */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
}
.section-title {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text);
}
.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 12px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== About ===== */
.about-content { max-width: 800px; margin: 0 auto; }
.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}
.about-text strong { color: var(--text); font-weight: 600; }
.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 32px;
}
.highlight-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.highlight-item:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow); }
.highlight-item i { font-size: 1.2rem; color: var(--primary); width: 24px; text-align: center; }
.highlight-item strong { display: block; font-size: 0.9rem; color: var(--text); }
.highlight-item span { font-size: 0.8rem; color: var(--text-muted); }

/* ===== Services ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.service-card {
    padding: 32px 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.service-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.service-icon {
    width: 48px; height: 48px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(37,99,235,0.08);
    color: var(--primary);
    border-radius: 12px;
    font-size: 1.2rem;
    margin-bottom: 16px;
}
.service-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.service-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== Timeline ===== */
.timeline { max-width: 700px; margin: 0 auto; position: relative; padding-left: 40px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 8px; top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--border));
}
.timeline-item { position: relative; margin-bottom: 32px; }
.timeline-marker {
    position: absolute;
    left: -40px; top: 4px;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--bg);
    border: 3px solid var(--primary);
    z-index: 2;
}
.timeline-content {
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.timeline-content:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.timeline-badge {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(37,99,235,0.08);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 8px;
    font-family: var(--font-mono);
}
.timeline-content h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 2px; }
.timeline-content h4 { font-size: 0.9rem; color: var(--text-secondary); font-weight: 500; margin-bottom: 8px; }
.timeline-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== Skills ===== */
.skills-categories { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 24px; }
.skill-category h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}
.skill-category h3 i { color: var(--primary); font-size: 0.9rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}
.skill-tag:hover { border-color: var(--primary); color: var(--primary); background: rgba(37,99,235,0.04); }

/* ===== Projects ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.project-card {
    padding: 28px 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}
.project-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.project-header > i { font-size: 1.4rem; color: var(--primary); }
.project-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: color var(--transition);
}
.project-links a:hover { color: var(--primary); }
.project-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.project-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; flex: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.project-tags span {
    padding: 4px 10px;
    background: var(--bg-alt);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}
.contact-card-group { display: flex; flex-direction: column; gap: 16px; }
.contact-card {
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.contact-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.contact-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.contact-card-header i { color: var(--primary); }
.contact-card-header h3 { font-size: 1rem; font-weight: 700; }
.contact-info { display: flex; flex-direction: column; gap: 10px; }
.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color var(--transition);
}
a.contact-item:hover { color: var(--primary); }
.contact-item i { width: 18px; text-align: center; color: var(--primary); font-size: 0.9rem; }
.contact-social-section { display: flex; flex-direction: column; gap: 20px; }
.contact-social-section h3 { font-size: 1.1rem; font-weight: 700; }
.contact-social-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.social-link-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}
.social-link-card:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.social-link-card i { font-size: 1.2rem; }
.vcard-download { margin-top: 8px; }

/* ===== Footer ===== */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
    background: var(--bg);
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-content p { font-size: 0.85rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 0.85rem; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--primary); }

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 32px; right: 32px;
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition);
    box-shadow: 0 4px 14px rgba(37,99,235,0.3);
    z-index: 99;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-2px); }

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .hero-container { grid-template-columns: 1fr; text-align: center; gap: 40px; }
    .hero-content { order: 2; }
    .hero-image { order: 1; }
    .hero-description { margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }
    .hero-social { justify-content: center; }
    .hero-image-wrapper { width: 260px; height: 260px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-center { display: none; }
    .nav-toggle { display: flex; }
    .nav-menu {
        position: fixed;
        top: 72px; left: 0; right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
        z-index: 999;
    }
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .nav-center.mobile-active { display: block; }
    .nav-menu a { padding: 12px 16px; font-size: 1rem; }
    .about-highlights { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 20px; padding: 16px 20px; }
    .stat-number { font-size: 1.4rem; }
    .footer-content { flex-direction: column; gap: 12px; text-align: center; }
    .lang-modal { padding: 32px 24px; }
}

@media (max-width: 480px) {
    .hero-image-wrapper { width: 220px; height: 220px; }
    .hero-stats { flex-direction: row; gap: 16px; }
    .section { padding: 60px 0; }
    .section-title { font-size: 1.6rem; }
}