/* CSS Variables for Theme Customization */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;
    --accent: #ffffff;
    --accent-hover: #e0e0e0;
    --border: #2a2a2a;
    --shadow: rgba(0, 0, 0, 0.5);
    --transition: 0.3s ease;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --text-primary: #0a0a0a;
    --text-secondary: #505050;
    --text-tertiary: #808080;
    --accent: #000000;
    --accent-hover: #2a2a2a;
    --border: #d0d0d0;
    --shadow: rgba(0, 0, 0, 0.1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(10, 10, 10, 0.8);
}

[data-theme="light"] .navbar {
    background-color: rgba(255, 255, 255, 0.8);
}

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

.nav-brand h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

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

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

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

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.05);
}

.theme-toggle .icon-light {
    display: none;
}

[data-theme="light"] .theme-toggle .icon-dark {
    display: none;
}

[data-theme="light"] .theme-toggle .icon-light {
    display: inline;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 0 4rem;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-tertiary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--accent);
    border-color: var(--accent);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border);
}

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

/* Sections */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* Projects Section */
.projects {
    background-color: var(--bg-secondary);
}

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

.project-card {
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow);
}

.project-image {
    position: relative;
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
}

.project-overlay {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.project-tag {
    background-color: var(--accent);
    color: var(--bg-primary);
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-content {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

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

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

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

.about-text h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    margin-top: 2rem;
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-list {
    list-style: none;
    padding-left: 0;
}

.about-list li {
    color: var(--text-secondary);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.about-list li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--text-primary);
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Contact Section */
.contact {
    background-color: var(--bg-secondary);
}

.contact-content {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
}

.contact-info {
    display: flex;
    flex-direction: row;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 900px;
}

.contact-item {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem 2.5rem;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
    flex: 1;
    min-width: 200px;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow);
}

.contact-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

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

.contact-item a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition);
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--text-secondary);
}

/* Contact Form */
.contact-form {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition);
}

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

.form-group textarea {
    resize: vertical;
}

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

.footer p {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

.footer-tagline {
    font-style: italic;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

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

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

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

    .about-text h3 {
        font-size: 1.3rem;
        margin-top: 1.5rem;
    }

    .about-text p {
        font-size: 0.95rem;
    }

    .about-stats {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .stat-card {
        flex: 1;
        min-width: 150px;
    }

    .contact-info {
        flex-direction: column;
        gap: 1.5rem;
    }

    .contact-item {
        width: 100%;
        min-width: unset;
    }
}

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

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .about-text h3 {
        font-size: 1.2rem;
        margin-top: 1.5rem;
    }

    .about-text p {
        font-size: 0.9rem;
        line-height: 1.7;
    }

    .about-list li {
        font-size: 0.9rem;
        padding: 0.4rem 0;
    }

    .about-stats {
        flex-direction: column;
    }

    .stat-card {
        padding: 1.5rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .stat-label {
        font-size: 0.9rem;
    }

    .contact-item {
        padding: 1.5rem 2rem;
    }

    .contact-item h3 {
        font-size: 1.3rem;
    }
}