:root {
    --primary: #0066cc;
    --primary-hover: #0052a3;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text);
    background-color: var(--bg);
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-badge {
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    background: var(--primary);
    padding: 4px 10px;
    border-radius: 6px;
    letter-spacing: 1px;
}

.logo-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.hero {
    padding: 60px 0 50px;
    text-align: center;
}

.hero h1 {
    font-size: 2.25rem;
    line-height: 1.25;
    margin-bottom: 16px;
    color: #0f172a;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 30px;
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
    box-shadow: var(--shadow);
}

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

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

.btn-secondary:hover {
    background-color: #e2e8f0;
}

.section {
    padding: 50px 0;
}

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

.section h2 {
    font-size: 1.75rem;
    margin-bottom: 24px;
    color: #0f172a;
}

.grid {
    display: grid;
    gap: 24px;
}

.cards {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.card-num {
    display: inline-block;
    width: 32px;
    height: 32px;
    line-height: 32px;
    background: #e0f2fe;
    color: var(--primary);
    text-align: center;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: 12px;
}

.card h3 {
    margin-bottom: 8px;
    font-size: 1.2rem;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

code {
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: Consolas, monospace;
    font-size: 0.9em;
    color: #0f172a;
}

.info-box {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.data-list {
    margin: 16px 0 16px 20px;
    color: var(--text);
}

.data-list li {
    margin-bottom: 8px;
}

.note {
    font-size: 0.95rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

.footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}