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

body {
    font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #0d1117;
    background-image:
        radial-gradient(ellipse 100% 80% at 50% -20%, rgba(80, 60, 120, 0.25), transparent 50%),
        linear-gradient(180deg, #121820 0%, #0d1117 50%, #0a0e14 100%);
    color: #e6edf3;
}

.login-container { width: 100%; max-width: 420px; padding: 24px; }

.login-box {
    background: #1f2937;
    border-radius: 16px;
    padding: 40px 36px;
    border: 1px solid rgba(241, 196, 15, 0.2);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
}

.login-box h1 {
    text-align: center;
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
    background: linear-gradient(180deg, #fff8dc, #f1c40f);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.login-box h2 {
    text-align: center;
    color: #9ca3af;
    margin-bottom: 28px;
    font-size: 14px;
    font-weight: 400;
}

.form-group { margin-bottom: 18px; }

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    font-size: 15px;
    background: rgba(13, 17, 23, 0.6);
    color: #f0f4f8;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input::placeholder { color: #6b7280; }

.form-group input:focus {
    outline: none;
    border-color: rgba(241, 196, 15, 0.45);
    box-shadow: 0 0 0 3px rgba(241, 196, 15, 0.12);
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(180deg, #ffd700, #f1c40f);
    color: #0d1117;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s;
}

.login-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(241, 196, 15, 0.35);
}

.login-tip {
    margin-top: 20px;
    text-align: center;
    color: #6b7280;
    font-size: 13px;
}