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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --accent: #667eea;
    --accent-hover: #5a67d8;
    --card-bg: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --text-primary: #f7fafc;
    --text-secondary: #cbd5e0;
    --accent: #667eea;
    --accent-hover: #5a67d8;
    --card-bg: #2d3748;
    --shadow: rgba(0, 0, 0, 0.3);
}

[data-theme="purple"] {
    --bg-primary: #1a0b2e;
    --bg-secondary: #2d1b4e;
    --text-primary: #f7e7ff;
    --text-secondary: #c8b1e4;
    --accent: #a855f7;
    --accent-hover: #9333ea;
    --card-bg: #2d1b4e;
    --shadow: rgba(168, 85, 247, 0.2);
}

[data-theme="sky"] {
    --bg-primary: #0c1821;
    --bg-secondary: #1b2a3a;
    --text-primary: #e0f2fe;
    --text-secondary: #7dd3fc;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --card-bg: #1b2a3a;
    --shadow: rgba(56, 189, 248, 0.2);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--card-bg);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
}

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

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.theme-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.theme-btn {
    background: var(--bg-secondary);
    border: none;
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.3s ease;
    font-size: 1rem;
}

.theme-btn:hover {
    background: var(--accent);
    color: white;
    transform: scale(1.1);
}

.theme-btn.active {
    background: var(--accent);
    color: white;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-button {
    background: var(--accent);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px var(--shadow);
}

section {
    padding: 5rem 5%;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--shadow);
    transition: all 0.3s ease;
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px var(--shadow);
}

.skill-card i {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.skill-card h3 {
    margin-bottom: 1rem;
}

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

.project-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow);
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px var(--shadow);
}

.project-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
}

.project-content {
    padding: 1.5rem;
}

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

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--bg-secondary);
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

footer {
    background: var(--card-bg);
    padding: 2rem 5%;
    text-align: center;
    box-shadow: 0 -2px 10px var(--shadow);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.social-links a {
    color: var(--text-primary);
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--accent);
    transform: scale(1.2);
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        right: -100%;
        flex-direction: column;
        background: var(--card-bg);
        width: 250px;
        padding: 2rem;
        box-shadow: -5px 0 15px var(--shadow);
        transition: right 0.3s ease;
    }

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

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content p {
        font-size: 1.2rem;
    }

    h2 {
        font-size: 2rem;
    }

    .theme-switcher {
        gap: 0.3rem;
    }

    .theme-btn {
        padding: 0.4rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

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