* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    color: #17202a;
    background: #f4f7fb;
}

.login-page {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(320px, 1fr) minmax(320px, 460px);
}

.brand-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 64px;
    color: #ffffff;
    background: linear-gradient(135deg, #0f2f4a, #1d6c75);
}

.brand-mark {
    width: 72px;
    height: 72px;
    display: grid;
    place-items: center;
    margin-bottom: 28px;
    border: 2px solid rgba(255, 255, 255, 0.72);
    border-radius: 8px;
    font-size: 28px;
    font-weight: 700;
}

.brand-panel h1 {
    margin: 0;
    font-size: 44px;
    font-weight: 700;
}

.brand-panel p {
    margin: 16px 0 0;
    font-size: 18px;
    opacity: 0.88;
}

.login-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 48px;
    background: #ffffff;
}

.login-panel h2 {
    margin: 0 0 32px;
    font-size: 28px;
}

.login-form {
    display: grid;
    gap: 22px;
}

.login-form label {
    display: grid;
    gap: 8px;
    font-size: 14px;
    color: #44515f;
}

.login-form input {
    height: 44px;
    padding: 0 14px;
    border: 1px solid #d8e0ea;
    border-radius: 6px;
    font-size: 15px;
    outline: none;
}

.login-form input:focus {
    border-color: #1d6c75;
    box-shadow: 0 0 0 3px rgba(29, 108, 117, 0.12);
}

.error-message {
    padding: 10px 12px;
    border-radius: 6px;
    color: #a83232;
    background: #fff0f0;
}

.login-form button {
    height: 46px;
    border: 0;
    border-radius: 6px;
    color: #ffffff;
    background: #1d6c75;
    font-size: 16px;
    cursor: pointer;
}

.login-form button:hover {
    background: #175862;
}

@media (max-width: 780px) {
    .login-page {
        grid-template-columns: 1fr;
    }

    .brand-panel {
        min-height: 260px;
        padding: 36px 28px;
    }

    .brand-panel h1 {
        font-size: 36px;
    }

    .login-panel {
        padding: 36px 28px;
    }
}