:root {
    --primary: #228b22;
    --dark: #1c1c1c;
    --light: #ffffff;
    --danger: #e53935;
    --muted: #555555;
    --bg: #f6f8fa;
    --card: #ffffff;
    --radius: 16px;
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
    --font:
        system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font);
    color: var(--dark);
    background-color: var(--bg);
    line-height: 1.55;
}

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

header {
    padding: 48px 24px;
    text-align: center;
    background: linear-gradient(130deg, var(--primary), #50c878);
    color: var(--light);
}

header h1 {
    margin: 0;
    font-size: clamp(2.2rem, 4vw, 3rem);
    letter-spacing: -0.02em;
}

header p {
    margin: 16px auto 0;
    max-width: 720px;
    font-size: 1.1rem;
    opacity: 0.92;
}

main {
    padding: 48px 24px;
    max-width: 1040px;
    margin: 0 auto;
}

.grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 1.35rem;
}

.card p {
    margin: 0 0 12px;
    color: var(--muted);
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(34, 139, 34, 0.14);
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.01em;
}

footer {
    text-align: center;
    padding: 24px 12px;
    color: var(--muted);
}

nav {
    background: var(--card);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1040px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 60px;
}

.nav-logo {
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin-left: 24px;
}

.nav-menu a {
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    margin: 3px 0;
    transition: 0.3s;
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background: var(--card);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 10px 0;
    }

    .nav-toggle {
        display: flex;
    }
}

@media (max-width: 520px) {
    header {
        padding: 40px 16px;
    }

    main {
        padding: 36px 16px;
    }
}