/* Theme Variables */
:root {
    /* Colors */
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f26;
    --bg-tertiary: #242933;
    --text-primary: #e6edf3;
    --text-secondary: #adbac7;
    --text-muted: #768390;
    --accent-primary: #3dd4bf;
    --accent-secondary: #5eead4;
    --accent-hover: #2fc9b0;
    --border-color: #2d333b;
    --code-bg: #161b22;
    --success: #3fb950;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    --border-radius: 8px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: 1.125rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

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

a:hover {
    color: var(--accent-primary);
}

ul, ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

strong {
    color: var(--text-primary);
    font-weight: 600;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: var(--accent-secondary);
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

pre code {
    background: none;
    padding: 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
}

/* Layout */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-3xl) 0;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

/* Mobile nav */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: var(--spacing-3xl);
}

.hero-title {
    margin-bottom: var(--spacing-sm);
}

.highlight {
    color: var(--accent-primary);
    font-weight: 700;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.hero-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: #0f1419;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(61, 212, 191, 0.25);
    background: var(--accent-secondary);
    color: #0f1419;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    color: var(--text-primary);
}

/* Project Section */
.project {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    color: var(--text-primary);
}

.project-hero {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.project-title {
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
}

.project-tagline {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--text-secondary);
    font-weight: 500;
    font-style: italic;
}

.content-block {
    max-width: var(--container-narrow);
    margin: 0 auto var(--spacing-2xl);
}

.content-block h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--spacing-md);
}

/* Tech Grid */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.tech-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.tech-item h5 {
    color: var(--accent-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.tech-item ul {
    margin-left: var(--spacing-md);
}

.tech-item li {
    font-size: 0.9rem;
}

/* Code Samples */
.code-sample {
    margin-bottom: var(--spacing-xl);
}

.code-label {
    color: var(--accent-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.code-note {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* Mockups & Screenshots */
.mockup-grid {
    display: grid;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.mockup-placeholder,
.screenshot-placeholder {
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.mockup-placeholder p,
.screenshot-placeholder p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.note {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

/* About Section */
.about {
    background: var(--bg-primary);
}

.about h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.about-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.about-content p {
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-layout {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.profile-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-primary);
    flex-shrink: 0;
}

.about-text {
    flex: 1;
}

@media (max-width: 768px) {
    .about-layout {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-photo {
        width: 150px;
        height: 150px;
        margin-bottom: var(--spacing-md);
    }
}

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

.contact h2 {
    margin-bottom: var(--spacing-md);
}

.contact-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.contact-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-width: 150px;
    transition: all var(--transition-base);
    color: var(--text-secondary);
}

.contact-link:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    background: var(--bg-primary);
    color: var(--accent-primary);
}

.contact-link svg {
    width: 32px;
    height: 32px;
}

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

.footer p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin: 0;
}

/* Mobile responsive */
@media (max-width: 768px) {
    section {
        padding: var(--spacing-2xl) 0;
    }

    .hero {
        padding-top: var(--spacing-2xl);
        min-height: 90vh;
    }

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

    .hero-links {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .contact-links {
        flex-direction: column;
        align-items: stretch;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 4px;
}