:root {
    --bg: #f7fbff;
    --surface: #ffffff;
    --muted: #64748b;
    --text: #0f172a;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #dbeafe;
    --glass: rgba(255, 255, 255, 0.7);
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 4px 12px rgba(15, 23, 36, 0.08);
    --shadow-lg: 0 10px 25px rgba(15, 23, 36, 0.12);
    --transition: all 0.3s ease;
}

[data-theme='dark'] {
    --bg: #0f172a;
    --surface: #1e293b;
    --muted: #94a3b8;
    --text: #f1f5f9;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a8a;
    --glass: rgba(15, 23, 42, 0.7);
    --shadow: 0 4px 12px rgba(2, 6, 23, 0.4);
    --shadow-lg: 0 10px 25px rgba(2, 6, 23, 0.6);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg) 0%, #f0f9ff 100%);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.site-header {
    backdrop-filter: blur(12px);
    background: var(--glass);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(15, 23, 36, 0.05);
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.brand {
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 101;
}

.brand::before {
    content: "</>";
    font-weight: 700;
    color: var(--accent);
}

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

.nav a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

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

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

.nav a:hover::after {
    width: 100%;
}

.header-cta {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn {
    background: var(--accent);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

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

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

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

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

.btn-ghost:hover {
    background: rgba(15, 23, 36, 0.05);
    color: var(--text);
    transform: none;
    box-shadow: none;
}

.icon-btn {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 10px;
    border: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.icon-btn:hover {
    transform: rotate(12deg);
}

/* Mobile Menu Button */
.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 30px;
    position: relative;
    z-index: 101;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text);
    margin: 6px 0;
    transition: var(--transition);
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Hero Section */
.hero {
    padding: 100px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-light) 0%, transparent 70%);
    opacity: 0.15;
    z-index: -1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 60px;
    align-items: start;
}

.eyebrow {
    color: var(--accent);
    font-weight: 700;
    margin: 0 0 12px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 16px;
    background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.lead {
    color: var(--muted);
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 32px;
    max-width: 90%;
}

.contact-badges {
    list-style: none;
    padding: 0;
    margin: 24px 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.contact-badges li {
    background: var(--surface);
    padding: 10px 16px;
    border-radius: 100px;
    box-shadow: var(--shadow);
    color: var(--muted);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.contact-badges li:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.contact-badges a {
    color: var(--muted);
    text-decoration: none;
    transition: var(--transition);
}

.contact-badges a:hover {
    color: var(--accent);
}

.hero-actions {
    margin-top: 32px;
    display: flex;
    gap: 16px;
}

.hero-card {
    background: linear-gradient(135deg, var(--surface), var(--glass));
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.hero-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(15, 23, 36, 0.15);
}

.hero-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    display: block;
    margin-bottom: 16px;
    border: 3px solid var(--accent-light);
}

.card-inner h3 {
    margin: 0 0 12px;
    font-size: 1.25rem;
}

.card-inner p {
    color: var(--muted);
    margin-bottom: 16px;
}

.meta {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
    color: var(--muted);
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.meta li strong {
    color: var(--text);
    display: block;
    margin-bottom: 4px;
}

/* Section */
.section {
    padding: 100px 0;
}

.section:nth-child(even) {
    background: rgba(15, 23, 36, 0.02);
}

h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 48px;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 20px;
    width: 2px;
    background: var(--accent-light);
    z-index: -1;
}

.timeline-item {
    background: var(--surface);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    position: relative;
    transition: var(--transition);
    margin-left: 40px;
}

.timeline-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -40px;
    top: 28px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--surface);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.timeline-item time {
    display: block;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.timeline-item h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.timeline-item p {
    color: var(--muted);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.skill-card {
    background: var(--surface);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
}

.skill-card h4 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.skill-card h4::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
}

.edu-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.edu-list li {
    background: var(--surface);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    padding-left: 60px;
}

.edu-list li:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.edu-list li::before {
    content: '🎓';
    position: absolute;
    left: 20px;
    top: 20px;
    font-size: 1.5rem;
}

.edu-list strong {
    display: block;
    margin-bottom: 4px;
}

.contact-section {
    background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
    border-radius: var(--radius-lg);
    padding: 60px;
    margin-top: 40px;
    box-shadow: var(--shadow-lg);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-info p {
    color: var(--muted);
    margin-bottom: 8px;
}

.contact-info a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.contact-info a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--surface);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.contact-form label {
    font-weight: 600;
    color: var(--text);
}

.contact-form input,
.contact-form textarea {
    padding: 12px 16px;
    border-radius: var(--radius);
    border: 1px solid rgba(15, 23, 36, 0.1);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.site-footer {
    padding: 40px 0;
    background: var(--surface);
    color: var(--muted);
    text-align: center;
    border-top: 1px solid rgba(15, 23, 36, 0.05);
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-card {
        max-width: 500px;
        margin: 0 auto;
    }

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

@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
    }

    .menu-toggle {
        display: block;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--surface);
        flex-direction: column;
        padding: 100px 30px 30px;
        transition: var(--transition);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 100;
    }

    .nav.active {
        right: 0;
    }

    .nav a {
        padding: 12px 0;
        border-bottom: 1px solid rgba(15, 23, 36, 0.05);
        width: 100%;
    }

    .nav a:last-child {
        border-bottom: none;
    }

    .header-cta {
        margin-left: auto;
        margin-right: 15px;
    }

    .btn-ghost span {
        display: none;
    }

    h1 {
        font-size: 2.5rem;
    }

    .lead {
        font-size: 1.1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .contact-section {
        padding: 40px 24px;
    }

    .timeline-item {
        margin-left: 30px;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-item::before {
        left: -30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 80px 0 60px;
    }

    .section {
        padding: 60px 0;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .contact-badges {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-cta {
        flex-direction: column;
        gap: 8px;
    }

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

    .btn-ghost {
        width: auto;
    }
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll to top button */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 99;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
}

.text-white {
    color: white !important;
}

/* overlay when mobile nav open */
.nav-overlay{
    position: fixed;
    inset: 0;
    background: rgba(2,6,23,0.45);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    z-index: 95;
}
.nav-overlay.visible{
    opacity: 1;
    visibility: visible;
}

/* ensure nav is visible on large screens even if classes remain */
@media (min-width: 769px){
    .nav{position: static !important; height: auto !important; width: auto !important; right: auto !important; top: auto !important; padding: 0 !important; background: transparent !important; box-shadow: none !important; display:flex}
}