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

:root {
    /* Color Palette - Friendly Dark Theme */
    --bg-color: #050a14; /* Deep Midnight Blue/Black */
    --surface-color: #111827; /* Dark Grey-Blue Surface */
    --primary-color: #2563eb; /* Vibrant Friendly Blue */
    --primary-hover: #1d4ed8; /* Darker Blue Interaction */
    --text-main: #f3f4f6; /* Soft White */
    --text-muted: #9ca3af; /* Soft Grey */
    --border-color: #1f2937; /* Subtle Divider */

    /* Typography */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;

    /* Spacing & Layout */
    --container-width: 1200px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    /* UI Elements */
    --radius-md: 12px;
    --radius-lg: 24px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
}

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

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

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

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--text-main);
}

h1 { font-size: 3rem; font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: 2.25rem; font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; font-weight: 600; }

p { margin-bottom: 1rem; }

/* Components */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--radius-md); /* Rounded buttons */
    font-weight: 600;
    text-align: center;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

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

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

.card {
    background-color: var(--surface-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

/* Header & Nav */
header {
    background-color: rgba(5, 10, 20, 0.95); /* Slight transparency */
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo img {
    height: 40px;
    width: auto;
    border-radius: 0; /* Keep logo sharp or natural */
}

/* Hamburger Button */
.hamburger-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-main);
    z-index: 1002; /* Above overlay */
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 40px;
    height: 40px;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--text-main);
    border-radius: 2px;
    transition: var(--transition);
}

/* Navigation Overlay */
.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1001;
}

.nav-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.nav-links {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nav-links a {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-muted);
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-lg) 0;
}

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

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--text-main) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Forms */
form {
    background-color: var(--surface-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    max-width: 600px;
    margin: 0 auto;
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input, textarea {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-family: var(--font-main);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

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

/* Responsive Tweaks */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
    }

    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}