:root {
    --primary-color: #0F6CBD;
    --primary-hover: #0c5696;
    --bg-color: #f3f2f1;
    --surface-color: #ffffff;
    --text-main: #201f1e;
    --text-muted: #605e5c;
    --border-color: #edebe9;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --surface-color: #1e1e1e;
        --text-main: #ffffff;
        --text-muted: #a0a0a0;
        --border-color: #333333;
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--surface-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    background-color: var(--primary-color);
    color: white;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

main {
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
    width: 100%;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), #4dabf5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2rem auto;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 2rem;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s ease, background-color 0.2s ease;
    box-shadow: 0 4px 14px rgba(15, 108, 189, 0.4);
}

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

.content-box {
    background-color: var(--surface-color);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    border: 1px solid var(--border-color);
}

.content-box h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.content-box h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.content-box p, .content-box ul {
    margin-bottom: 1.25rem;
    color: var(--text-muted);
}

.content-box ul {
    padding-left: 1.5rem;
}

.content-box li {
    margin-bottom: 0.5rem;
}

.last-updated {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

footer {
    background-color: var(--surface-color);
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    margin-top: auto;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
    .content-box {
        padding: 1.5rem;
    }
}