:root {
    --primary: #0f172a;
    --secondary: #2563eb;
    --accent: #38bdf8;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--primary);
    line-height: 1.2;
    margin-bottom: 1rem;
}

a {
    color: var(--secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Nav */
header {
    background-color: var(--surface);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo img {
    height: 32px;
    width: 32px;
}

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

nav a {
    color: var(--text-main);
    font-weight: 500;
}

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

.btn {
    display: inline-block;
    background-color: var(--secondary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
    text-align: center;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn:hover {
    background-color: #1d4ed8;
    color: white;
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(to right, #0f172a, #1e293b);
    color: white;
    text-align: center;
}

.hero h1 {
    color: white;
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    color: #cbd5e1;
    max-width: 800px;
    margin: 0 auto 2rem;
}

/* Content Sections */
.section-padding {
    padding: 5rem 0;
}

.bg-surface {
    background-color: var(--surface);
}

.grid {
    display: grid;
    gap: 2rem;
}

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

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
    .grid-cols-2, .grid-cols-3 {
        grid-template-columns: 1fr;
    }
    nav ul {
        display: none; /* Mobile menu needed for real build */
    }
}

.card {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    border: 1px solid var(--border);
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-family: inherit;
}

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

/* Footer */
footer {
    background-color: var(--primary);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: white;
    margin-bottom: 1.5rem;
}

.footer-col ul {
    list-style: none;
}

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

.footer-col a {
    color: var(--text-light);
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 2rem;
    text-align: center;
    color: var(--text-light);
}