:root {
    --bg-color: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-main: #e5e7eb;
    --text-sub: #94a3b8;
    --accent: #38bdf8;
    --border: rgba(255, 255, 255, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
                 "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
    background: radial-gradient(1200px at 20% 10%, #1e293b, transparent),
                radial-gradient(1200px at 80% 90%, #020617, transparent),
                var(--bg-color);
    color: var(--text-main);
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

.nav a {
    margin-left: 24px;
    font-size: 14px;
    color: var(--text-sub);
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    backdrop-filter: blur(10px);
}

.footer {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: #64748b;
    text-align: center;
}