:root {
    --primary: #10b981;
    --primary-hover: #34d399;
    --bg: #020617;
    --bg-alt: #0f172a;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #1e293b;
    --dark: #000000;
    --white: #ffffff;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
    --glass: rgba(2, 6, 23, 0.8);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text);
    background-color: var(--bg);
    line-height: 1.6;
}

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

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 2rem;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

p {
    margin-bottom: 1rem;
}

/* Header & Nav */
header {
    height: 80px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--glass);
    backdrop-filter: blur(12px);
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo span {
    color: var(--primary);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Buttons */
.btn-primary {
    background-color: var(--primary);
    color: var(--white) !important;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: background-color 0.2s;
    text-decoration: none;
}

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

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-secondary:hover {
    background-color: var(--bg-alt);
    border-color: var(--primary);
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 101;
}

.mobile-menu-btn span {
    width: 100%;
    height: 2px;
    background-color: var(--text);
    transition: all 0.3s;
    border-radius: 2px;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(9.5px) rotate(45deg);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-9.5px) rotate(-45deg);
}

/* Hero Section */
#about {
    padding: 10rem 0 8rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--primary);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* Sections */
section {
    padding: 8rem 0;
}

.bg-alt {
    background-color: var(--bg-alt);
}

.bg-dark {
    background-color: var(--dark);
    color: var(--white);
}

.bg-dark h2, .bg-dark p {
    color: var(--white);
}

/* Timeline/Experience */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 2rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-dot {
    position: absolute;
    left: -2.4rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    background-color: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-alt);
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

.company {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1rem;
}

.achievements {
    margin-top: 1rem;
    padding-left: 1.5rem;
    color: var(--text-muted);
}

.projects {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.project-item {
    padding: 1rem;
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    color: var(--text-muted);
}

.project-item strong {
    color: var(--text);
    display: block;
    margin-bottom: 0.25rem;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background-color: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.project-content {
    padding: 2rem;
    flex-grow: 1;
}

.project-content h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1.5rem 0;
}

.tag {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.project-links {
    display: flex;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background-color: rgba(0, 0, 0, 0.2);
    border-top: 1px solid var(--border);
}

.project-link {
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.2s;
}

.project-link:hover {
    color: var(--primary);
}

.achievements li {
    margin-bottom: 0.5rem;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-card {
    padding: 3rem;
    background-color: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.skill-card h4 {
    margin-bottom: 1rem;
}

.skill-card p {
    color: var(--text-muted);
    margin: 0;
}

/* Contact */
.contact-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 4rem;
}

.contact-text {
    flex: 1;
}

.contact-links {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: block;
    padding: 1.5rem;
    background-color: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    transition: all 0.3s ease;
}

.contact-item:hover {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: var(--primary);
    transform: translateY(-4px);
}

.contact-item span {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.contact-item strong {
    font-size: 1.25rem;
    color: var(--text);
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    
    .mobile-menu-btn {
        display: flex;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        z-index: 99;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        display: block;
        padding: 1rem;
        font-size: 1.25rem;
    }

    .contact-wrapper { flex-direction: column; text-align: center; }
    #about { padding: 6rem 0 4rem; }
}