:root {
    /* Light Theme (Default) - Soft black & white */
    --bg-primary: #f5f5f5;  /* Soft off-white */
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #222222;
    --text-secondary: #555555;
    --border-color: #e0e0e0;
    --accent-color: #222222;
    --accent-hover: #000000;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --code-bg: #1a1a1a;
    --code-text: #f0f0f0;
}

[data-theme="dark"] {
    /* Dark Theme - Soft black theme */
    --bg-primary: #121212;
    --bg-secondary: #1a1a1a;
    --bg-card: #1e1e1e;
    --text-primary: #f0f0f0;
    --text-secondary: #aaaaaa;
    --border-color: #333333;
    --accent-color: #ffffff;
    --accent-hover: #dddddd;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --code-bg: #000000;
    --code-text: #ffffff;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px var(--shadow-color);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    height: 40px;
    width: auto;
    border-radius: 5px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

@media (max-width: 768px) {
    .logo-text {
        display: none;
    }

    .logo-container {
        gap: 0.5rem;
    }
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

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

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background-color: var(--border-color);
    transform: rotate(30deg);
}

/* Hero */
.hero {
    padding: 4rem 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: all 0.3s;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
    background: var(--accent-hover);
    color: var(--bg-primary);
}

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

/* Code Window */
.code-window {
    background: var(--code-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.window-header {
    background: #2d2d2d;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27ca3f; }

.window-header span {
    color: #888;
    font-size: 0.9rem;
    margin-left: 0.5rem;
}

.window-content {
    padding: 1.5rem;
}

.window-content pre {
    margin: 0;
    overflow-x: auto;
}

.window-content code {
    color: var(--code-text);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Projects */
.projects {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.project-card {
    background: var(--bg-card);
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 15px var(--shadow-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px var(--shadow-color);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-header h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

.project-tag {
    background: var(--border-color);
    color: var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech span {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

.project-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s;
}

.project-link:hover {
    border-bottom: 1px solid var(--text-primary);
}

/* Skills */
.skills {
    padding: 4rem 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.skill-category {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.skill-category h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.skill-category li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

/* Contact */
.contact {
    padding: 4rem 0;
    background: var(--bg-primary);
    text-align: center;
}

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

.contact-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

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

.contact-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--text-primary);
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s;
}

.contact-link:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
}

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

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-content p {
    margin: 0;
    flex: 1;
    text-align: right;
}

/* Responsive adjustments for footer */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .footer-content p {
        text-align: center;
    }
}

/* Active nav link style */
.nav a.active {
    color: var(--text-primary);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}