body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f7fb;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    padding: 24px;
}

.login-card h1 {
    margin: 0 0 8px;
    font-size: 22px;
}

.subtitle {
    color: #666;
    margin: 0 0 18px;
}

label {
    display: block;
    margin: 12px 0 6px;
    font-size: 14px;
}

input {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid #d9d9d9;
    border-radius: 8px;
    padding: 10px 12px;
}

button {
    margin-top: 16px;
    width: 100%;
    border: 0;
    background: #1677ff;
    color: #fff;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
}

.error-box {
    margin-top: 12px;
    background: #fff1f0;
    color: #cf1322;
    border: 1px solid #ffa39e;
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 13px;
}

.hint {
    margin-top: 14px;
    font-size: 12px;
    color: #888;
}