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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #6366f1;
    --accent-light: #818cf8;
    --accent-dark: #4f46e5;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --border-color: #e0e0e0;
    --link-color: #6366f1;
    --link-hover: #4f46e5;
    --success-color: #10b981;
}

[data-theme="dark"] {
    --primary-color: #e4e6eb;
    --secondary-color: #b0b3b8;
    --text-color: #e4e6eb;
    --text-light: #b0b3b8;
    --bg-color: #18191a;
    --bg-light: #242526;
    --border-color: #3a3b3c;
    --link-color: #818cf8;
    --link-hover: #a5b4fc;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
    background-color: rgba(24, 25, 26, 0.95);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 400;
    transition: color 0.3s ease;
}

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

/* Theme Toggle */
.theme-toggle-wrapper {
    position: relative;
}

.theme-toggle {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.theme-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.theme-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-option {
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--accent-color);
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-option:first-child {
    border-radius: 8px 8px 0 0;
}

.theme-option:last-child {
    border-radius: 0 0 8px 8px;
}

.theme-option:hover {
    background: var(--bg-light);
}

.theme-option[data-theme="dark"]:hover {
    color: white;
}

.theme-option.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-color);
    font-weight: 500;
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    text-align: center;
    background: linear-gradient(135deg, #fce7f3 0%, #ffffff 50%, #f0f4ff 100%);
    position: relative;
}

[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #2d1b2e 0%, #18191a 50%, #1a1b2e 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-gradient);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 300;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    font-weight: 300;
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: center;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--bg-gradient);
    border-radius: 2px;
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

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

.project-card {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-left: 4px solid #e0e7ff;
    border-radius: 4px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-left-color 0.3s ease;
    background-color: var(--bg-color);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.15);
    border-left-color: var(--accent-color);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-dark);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.project-card:hover .project-title {
    color: var(--accent-color);
}

.project-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Skills Section */
.skills-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.skill-category {
    text-align: center;
}

.skill-category-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--accent-dark);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.skill-category-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: var(--bg-gradient);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: 0.75rem 0;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    padding-left: 1.5rem;
}

.skill-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.skill-list li:last-child {
    border-bottom: none;
}

/* Contact Section */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-intro {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.contact-form {
    margin-bottom: 3rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.submit-btn {
    width: 100%;
    padding: 0.75rem 2rem;
    background: var(--bg-gradient);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.social-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    display: inline-block;
}

.social-link:hover {
    color: var(--accent-dark);
    background-color: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

#email-placeholder {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.3px;
}

#email-placeholder:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .skills-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section {
        padding: 60px 0;
    }
}