/* --- Base Resets & Variables --- */
:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --accent: #22d3ee;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --container-width: 1140px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
}

body {
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 100px 0;
}

/* --- Typography Helpers --- */
span {
    color: var(--accent);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    margin-bottom: 10px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 2px solid var(--text-muted);
}

.btn-secondary:hover {
    border-color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-block {
    width: 100%;
    border: none;
}

/* --- Navbar Layout --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.05em;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 30px;
    font-weight: 500;
    transition: var(--transition);
}

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

.nav-links .btn-nav {
    color: white;
    background-color: var(--primary);
    padding: 8px 18px;
    border-radius: 6px;
}

.nav-links .btn-nav:hover {
    background-color: var(--primary-hover);
}

/* Hidden inputs for pure CSS responsive mobile menu */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
}

/* --- Hero Section --- */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 120px;
    background: radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
}

.hero-content {
    max-width: 700px;
}

.hero-subtitle {
    color: var(--primary);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: 15px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.05em;
    margin-bottom: 25px;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-cta .btn {
    margin-right: 15px;
    margin-bottom: 15px;
}

/* --- About Section --- */
.about-section {
    background-color: rgba(30, 41, 59, 0.3);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background-color: var(--bg-card);
    padding: 40px 20px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-card h3 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 10px;
}

.stat-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* --- Services Section --- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--bg-card);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.2);
}

.service-card .icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.service-card p {
    color: var(--text-muted);
}

/* --- Tech Stack Section --- */
.tech-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
}

.tech-tag {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.tech-tag:hover {
    background-color: rgba(99, 102, 241, 0.1);
    border-color: var(--primary);
    color: var(--text-main);
}

/* --- Contact Section --- */
.contact-section {
    background-color: rgba(30, 41, 59, 0.3);
}

.contact-box {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--bg-card);
    padding: 50px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-form .form-group {
    margin-bottom: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 16px;
    background-color: var(--bg-dark);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* --- Footer --- */
.footer {
    padding: 40px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 0.95rem;
}

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

.footer-socials a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 20px;
    transition: var(--transition);
}

.footer-socials a:hover {
    color: var(--text-main);
}

/* --- Responsive Media Queries (Mobile & Tablet) --- */
@media (max-width: 968px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 70px 0;
    }
    
    /* Pure CSS Mobile Navigation System */
    .nav-toggle-label {
        display: block;
        position: relative;
        height: 20px;
        width: 30px;
    }
    
    .nav-toggle-label span,
    .nav-toggle-label span::before,
    .nav-toggle-label span::after {
        display: block;
        background-color: var(--text-main);
        height: 2px;
        width: 100%;
        position: absolute;
        transition: var(--transition);
    }
    
    .nav-toggle-label span::before { content: ''; top: -8px; }
    .nav-toggle-label span::after { content: ''; top: 8px; }
    
    .nav-links {
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg-dark);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        display: none;
        flex-direction: column;
        padding: 20px 0;
        text-align: center;
    }
    
    .nav-links a {
        margin: 15px 0;
        display: block;
    }
    
    .nav-links .btn-nav {
        display: inline-block;
        margin: 10px auto;
    }
    
    /* Toggle menu state when checkbox is checked */
    .nav-toggle:checked ~ .nav-links {
        display: flex;
    }
    
    .nav-toggle:checked ~ .nav-toggle-label span { background: transparent; }
    .nav-toggle:checked ~ .nav-toggle-label span::before { transform: rotate(45deg); top: 0; }
    .nav-toggle:checked ~ .nav-toggle-label span::after { transform: rotate(-45deg); top: 0; }
    
    /* Adjust Hero */
    .hero-title {
        font-size: 2.5rem;
    }
    
    .contact-box {
        padding: 30px 20px;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .footer-socials a {
        margin: 0 10px;
    }
}