:root {
    --page-bg: #f4f6f8;
    --panel: #ffffff;
    --ink: #172033;
    --muted: #697386;
    --line: #dde2e8;
    --brand: #111b3f;
    --danger: #c53b35;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--page-bg);
    font-family: Arial, "Microsoft YaHei", sans-serif;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px 16px;
}

.login-panel {
    width: min(420px, calc(100vw - 32px));
    min-height: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 38px 28px 28px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(23, 32, 51, 0.08);
}

.login-brand {
    width: 75px;
    height: 75px;
    flex: 0 0 75px;
    display: grid;
    place-items: center;
    margin-bottom: 18px;
    border-radius: 8px;
    overflow: hidden;
    background: #ffffff;
}

.login-brand img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.login-copy {
    text-align: center;
    margin-bottom: 22px;
}

.login-copy h1 {
    margin: 0 0 9px;
    font-size: 25px;
    line-height: 1.25;
    letter-spacing: 0;
}

.login-copy p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.login-qr-wrap {
    position: relative;
    width: 300px;
    height: 300px;
    max-width: 100%;
    overflow: hidden;
    background: #ffffff;
    border-radius: 8px;
}

.login-qr {
    width: 444px;
    height: 548px;
    transform: translate(-72px, -156px);
}

.login-qr-mask {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--muted);
    background: #ffffff;
    font-size: 13px;
}

.login-qr-mask[hidden] {
    display: none;
}

.login-error {
    width: 100%;
    margin: 16px 0 0;
    padding: 10px 12px;
    color: var(--danger);
    background: #fff4f2;
    border-radius: 6px;
    font-size: 13px;
    text-align: center;
}

@media (max-width: 480px) {
    .login-panel {
        min-height: 470px;
        padding: 30px 16px 22px;
    }

    .login-qr-wrap {
        width: min(300px, calc(100vw - 64px));
        height: min(300px, calc(100vw - 64px));
    }
}