:root {
    --bg-dark: #090a0f;
    --bg-card: rgba(18, 20, 32, 0.65);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(139, 92, 246, 0.4);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --primary: #8b5cf6;
    --primary-glow: rgba(139, 92, 246, 0.25);
    --accent: #06b6d4;
    --accent-glow: rgba(6, 182, 212, 0.25);
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
    background-attachment: fixed;
}

/* Header & Navigation */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 4rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(9, 10, 15, 0.7);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.gradient-text {
    background: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(139, 92, 246, 0.3);
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    animation: fadeIn 1s ease-out;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 2.5rem;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 1.25rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    color: #fff;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(139, 92, 246, 0.45);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Projects Section */
.projects-section {
    padding: 6rem 4rem;
    background: rgba(18, 20, 32, 0.2);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #8b5cf6, #06b6d4);
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.15);
}

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

.project-badge {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
}

.project-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: rgba(139, 92, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: 2rem;
}

.project-card:nth-child(2) .project-icon {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent);
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.75rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.project-tech span {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.65rem;
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
    width: 100%;
}

.project-link i {
    width: 16px;
    height: 16px;
    transition: var(--transition);
}

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

.project-card:nth-child(2):hover .project-link {
    color: var(--accent);
}

.project-card:hover .project-link i {
    transform: translate(2px, -2px);
}

/* Skills Section */
.skills-section {
    padding: 6rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2.5rem;
}

.skill-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: var(--transition);
}

.skill-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.15);
}

.skill-item i {
    width: 36px;
    height: 36px;
    color: var(--accent);
    margin-bottom: 1.25rem;
}

.skill-item h4 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

.skill-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 300;
}

/* Footer Section */
.footer {
    padding: 6rem 4rem 2rem;
    border-top: 1px solid var(--border-color);
    background: rgba(9, 10, 15, 0.9);
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto 4rem;
}

.footer-content h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-methods {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.03);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.footer-bottom {
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .header {
        padding: 1rem 2rem;
    }
    .nav {
        gap: 1.5rem;
    }
    .hero-title {
        font-size: 2.8rem;
    }
    .projects-section, .skills-section, .footer {
        padding: 4rem 2rem;
    }
}