* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #f1f5f9;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 16px;
    color: #1e293b;
}
.container { max-width: 420px; width: 100%; }
.card {
    background: #ffffff;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.06);
    padding: 32px 24px;
}
.header {
    text-align: center;
    margin-bottom: 24px;
}
.header .logo { font-size: 48px; color: #2d7aff; }
.header h1 { font-size: 24px; font-weight: 700; margin: 4px 0 2px; color: #0f172a; }
.header p { color: #64748b; font-size: 15px; }
.btn {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: 0.2s;
    touch-action: manipulation;
    text-decoration: none;
    color: #fff;
}
.btn-primary { background: #2d7aff; }
.btn-primary:hover { background: #1a5fd9; }
.btn-success { background: #22c55e; }
.btn-success:hover { background: #16a34a; }
.btn .material-icons { font-size: 22px; }
.link {
    text-align: center;
    margin-top: 14px;
    font-size: 14px;
    color: #64748b;
}
.link a { color: #2d7aff; text-decoration: none; font-weight: 600; }
.link a:hover { text-decoration: underline; }
.footer {
    margin-top: 20px;
    text-align: center;
    color: #94a3b8;
    font-size: 12px;
    border-top: 1px solid #eef2f6;
    padding-top: 16px;
}
@media (max-width: 480px) {
    .card { padding: 24px 16px; }
}