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

:root {
    --bg-primary: #1F1F1F;
    --bg-secondary: #2a2a2a;
    --bg-accent: #333333;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border-color: #404040;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

body {
    display: flex;
    flex-direction: column;
}

header {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    text-decoration: none;
    letter-spacing: -0.02em;
}

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

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

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

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

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

.volume-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.volume-control label {
    font-size: 1.2rem;
    cursor: pointer;
}

.volume-slider {
    width: 120px;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    transition: var(--transition);
}

.volume-slider::-webkit-slider-thumb:hover {
    box-shadow: 0 0 8px var(--accent-color);
}

.volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.volume-slider::-moz-range-thumb:hover {
    box-shadow: 0 0 8px var(--accent-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

section {
    margin-bottom: 4rem;
    animation: fadeIn 0.6s ease-out;
}

section:last-child {
    margin-bottom: 2rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1, h2, h3, h4 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

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

.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
    margin: 3rem 0 4rem;
}

.hero-content h1 {
    margin-bottom: 1rem;
    font-size: 3rem;
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 500px;
}

.cta-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid var(--accent-color);
    cursor: pointer;
    font-size: 0.95rem;
}

.cta-button:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cta-button.secondary {
    background: transparent;
    color: var(--accent-color);
}

.cta-button.secondary:hover {
    background: var(--bg-accent);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.portfolio-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.portfolio-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.portfolio-card-image {
    width: 100%;
    height: 200px;
    background: var(--bg-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    overflow: hidden;
}

.portfolio-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.portfolio-card:hover .portfolio-card-image img {
    transform: scale(1.05);
}

.portfolio-card-content {
    padding: 1.5rem;
}

.portfolio-card-content h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.portfolio-card-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.about-section,
.work-section {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin: 2rem 0;
}

.about-section h3,
.work-section h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.card-list {
    list-style: none;
    margin: 1.5rem 0;
}

.card-list-item {
    background: var(--bg-secondary);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    transition: var(--transition);
}

.card-list-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.card-list-item h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.card-list-item p {
    margin: 0;
    color: var(--text-secondary);
}

footer {
    background: var(--bg-accent);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin: 1rem 0;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    color: var(--accent-color);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.social-links a:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    nav {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero {
        flex-direction: column;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

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

code {
    background: var(--bg-accent);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--accent-color);
}

pre {
    background: var(--bg-accent);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
}

pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.text-muted {
    color: var(--text-muted);
}

.text-secondary {
    color: var(--text-secondary);
}