/* CSS Variables for Theme Switching */
:root {
    /* Light Theme Colors */
    --bg-primary: #FAFAFA;
    --bg-secondary: #F5F5F5;
    --bg-tertiary: #EBEBEB;
    --text-primary: #1A1A1A;
    --text-secondary: #4A4A4A;
    --text-tertiary: #6A6A6A;
    --border-color: #E0E0E0;
    --accent-color: #2A2A2A;
    --accent-hover: #1A1A1A;
    --card-bg: #FFFFFF;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --code-bg: #F8F8F8;
    --code-keyword: #0066CC;
    --code-string: #008800;
    --code-class: #AA00AA;
    --code-function: #CC6600;
}

[data-theme="dark"] {
    /* Dark Theme Colors */
    --bg-primary: #1A1A1A;
    --bg-secondary: #202020;
    --bg-tertiary: #2A2A2A;
    --text-primary: #F0F0F0;
    --text-secondary: #B0B0B0;
    --text-tertiary: #808080;
    --border-color: #3A3A3A;
    --accent-color: #E0E0E0;
    --accent-hover: #FFFFFF;
    --card-bg: #252525;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --code-bg: #1E1E1E;
    --code-keyword: #569CD6;
    --code-string: #CE9178;
    --code-class: #C586C0;
    --code-function: #DCDCAA;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    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: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-text {
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    border-color: var(--accent-color);
    transform: rotate(180deg);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

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

[data-theme="dark"] .moon-icon {
    display: block;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-color), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-weight: 400;
}

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

.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    cursor: pointer;
    border: 2px solid transparent;
    font-size: 0.95rem;
}

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

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

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

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

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

/* Code Window */
.hero-visual {
    margin-top: 4rem;
}

.code-window {
    background-color: var(--code-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.window-header {
    background-color: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    display: flex;
    gap: 0.5rem;
}

.window-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--border-color);
}

.window-dot:first-child {
    background-color: #FF5F56;
}

.window-dot:nth-child(2) {
    background-color: #FFBD2E;
}

.window-dot:nth-child(3) {
    background-color: #27C93F;
}

.code-content {
    padding: 1.5rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    overflow-x: auto;
}

.code-content .keyword {
    color: var(--code-keyword);
}

.code-content .string {
    color: var(--code-string);
}

.code-content .class {
    color: var(--code-class);
}

.code-content .function {
    color: var(--code-function);
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    padding: 80px 0;
    background-color: var(--bg-secondary);
}

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

.about-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 60px;
    height: 60px;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.about-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Services Section */
.services {
    padding: 80px 0;
    background-color: var(--bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.service-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.service-icon {
    width: 48px;
    height: 48px;
    background-color: var(--bg-tertiary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.service-card h3 {
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.service-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: 0.5rem 0;
    color: var(--text-tertiary);
    font-size: 0.9rem;
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Portfolio Section */
.portfolio {
    padding: 80px 0;
    background-color: var(--bg-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.portfolio-item {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.portfolio-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.portfolio-image {
    height: 200px;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.portfolio-placeholder {
    color: var(--text-tertiary);
}

.portfolio-content {
    padding: 1.5rem;
}

.portfolio-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.portfolio-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-tertiary);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Tech Stack Section */
.tech-stack {
    padding: 80px 0;
    background-color: var(--bg-primary);
}

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

.tech-category h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-item {
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.tech-item:hover {
    background-color: var(--accent-color);
    color: var(--bg-primary);
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background-color: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

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

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.form-group label {
    position: absolute;
    left: 1rem;
    top: 1rem;
    color: var(--text-tertiary);
    transition: all 0.3s ease;
    pointer-events: none;
    background-color: var(--card-bg);
    padding: 0 0.25rem;
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: -0.5rem;
    font-size: 0.875rem;
    color: var(--accent-color);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.info-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.info-item svg {
    color: var(--accent-color);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.info-item h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.info-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    background-color: var(--bg-tertiary);
    padding: 40px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-logo {
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-address {
    margin-top: 2rem;
}

.footer-address h4 {
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.footer-address p {
    color: var(--text-secondary);
    line-height: 1.4;
    font-size: 0.9rem;
    margin-bottom: 0;
}

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

.social-links a {
    width: 36px;
    height: 36px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background-color: var(--accent-color);
    color: var(--bg-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-tertiary);
}

/* Responsive Design */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: 5rem 2rem;
        transition: right 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

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

    .mobile-toggle {
        display: flex;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
    }

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

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.about-card,
.service-card,
.portfolio-item {
    animation: fadeIn 0.6s ease-out;
}

/* Scroll animations */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}