:root {
    /* Color Palette */
    --primary: hsl(220, 90%, 56%);
    --primary-hover: hsl(220, 90%, 50%);
    --secondary: hsl(210, 20%, 98%);
    --accent: hsl(160, 84%, 39%);
    --navy: hsl(222, 47%, 11%);
    --text-main: hsl(215, 25%, 27%);
    --text-muted: hsl(215, 16%, 47%);
    --bg-main: hsl(210, 40%, 99%);
    --white: hsl(0, 0%, 100%);
    --border: hsl(214, 32%, 91%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

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

    /* Layout */
    --header-h: 80px;
    --container-max: 1200px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: all 0.2s ease;
}

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

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--navy);
    letter-spacing: -0.02em;
}

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

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
}

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

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(37, 99, 235, 0.25);
    color: var(--white);
}

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

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

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: radial-gradient(circle at top right, hsl(220, 100%, 98%), var(--bg-main));
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    max-width: 800px;
    margin: 0 auto 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

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

/* Features Grid */
.features {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

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

.card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.icon-box {
    width: 56px;
    height: 56px;
    background: var(--secondary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 1.5rem;
}

/* Footer */
footer {
    background: var(--navy);
    color: var(--white);
    padding: 4rem 0;
    margin-top: 6rem;
}

footer .logo {
    color: var(--white);
}

footer p {
    color: hsl(215, 10%, 70%);
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }
}