/* --- Base Styles & Variables --- */
:root {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --border-color: #1f2937;
    
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --accent-rgb: 20, 184, 166; /* Teal 500: #14b8a6 */
    --accent-color: rgb(var(--accent-rgb));
    --accent-glow: rgba(var(--accent-rgb), 0.08);
    
    --font-sans: 'Outfit', sans-serif;
    
    --transition-speed: 0.3s;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

[data-theme="light"] {
    --bg-primary: #fcfcfd;
    --bg-secondary: #ffffff;
    --border-color: #e5e7eb;
    
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    
    --accent-rgb: 13, 148, 136; /* Teal 600 */
    --accent-glow: rgba(var(--accent-rgb), 0.05);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* --- Header & Navigation --- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(var(--bg-primary), 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent-color);
}

.nav {
    display: flex;
    gap: 2rem;
}

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

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

.theme-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

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

.theme-btn svg {
    width: 18px;
    height: 18px;
}

/* Theme icon toggles */
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* --- Hero Section --- */
.hero {
    padding: 6rem 0 5rem 0;
    position: relative;
}

.hero-container {
    display: flex;
    justify-content: center;
    text-align: center;
}

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

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.75rem;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.badge::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: #10b981;
    border-radius: 50%;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    text-decoration: none;
    transition: all var(--transition-speed) ease;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 14px 0 rgba(var(--accent-rgb), 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(var(--accent-rgb), 0.4);
}

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

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

/* --- Section Commons --- */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 40px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* --- About Section --- */
.about {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: center;
}

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

.about-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.stat-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-num {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Skills Section --- */
.skills {
    padding: 6rem 0;
    background-color: rgba(var(--bg-secondary), 0.2);
    border-top: 1px solid var(--border-color);
}

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

.skill-category {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 12px;
    transition: transform var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.skill-category:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--accent-rgb), 0.5);
}

.skill-category h3 {
    font-size: 1.15rem;
    margin-bottom: 1.25rem;
    font-weight: 600;
}

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

.tag {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-radius: 6px;
    font-weight: 500;
}

/* --- Projects Section --- */
.projects {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: rgba(var(--accent-rgb), 0.4);
    box-shadow: var(--shadow-lg);
}

.project-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
}

.project-status {
    align-self: flex-start;
    padding: 0.15rem 0.5rem;
    background-color: rgba(16, 185, 129, 0.15); /* Green */
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.3);
    font-size: 0.75rem;
    border-radius: 4px;
    font-weight: 600;
}

.project-status.in-dev {
    background-color: rgba(245, 158, 11, 0.15); /* Amber */
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.project-name {
    font-size: 1.3rem;
    font-weight: 600;
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.tag-small {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 1rem;
    transition: color var(--transition-speed) ease;
}

.project-link svg {
    transition: transform var(--transition-speed) ease;
}

.project-link:hover {
    color: rgba(var(--accent-rgb), 0.8);
}

.project-link:hover svg {
    transform: translate(2px, -2px);
}

/* --- Contact Section --- */
.contact {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.contact-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.contact-prompt {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.contact-item:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

/* --- Footer --- */
.footer-site {
    border-top: 1px solid var(--border-color);
    padding: 2.5rem 0;
    text-align: center;
    background-color: rgba(var(--bg-secondary), 0.2);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* --- Responsive Layouts --- */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .header {
        position: relative;
    }
    
    .nav {
        display: none; /* simple responsive structure without redundant complexities */
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    
    .contact-card {
        padding: 2rem;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* ponytail: responsive layout handled purely with standard media query breakpoints and flexbox/grid layout, no complex utility classes or UI frameworks */