* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: #2c3e50;
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background:
        radial-gradient(circle at 20% 15%, rgba(79, 156, 255, 0.35), transparent 30%),
        radial-gradient(circle at 80% 85%, rgba(47, 128, 237, 0.35), transparent 30%),
        #0b1220;
}

.login-panel {
    width: 100%;
    max-width: 400px;
}

.login-brand {
    display: flex;
    align-items: center;
    gap: 14px;
    color: #fff;
    margin-bottom: 22px;
    padding: 0 4px;
}

.brand-icon {
    color: #6aa9ff;
    display: flex;
}

.login-brand h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
}

.login-brand p {
    margin: 4px 0 0;
    color: #a5b4c8;
    font-size: 13px;
}

.login-card {
    background: #fff;
    border-radius: 14px;
    padding: 26px 24px 24px;
    box-shadow: 0 18px 45px rgba(4, 12, 28, 0.45);
}

.field {
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid #dcdfe6;
    border-radius: 10px;
    padding: 0 14px;
    height: 48px;
    margin-bottom: 16px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.field:focus-within {
    border-color: #4f9cff;
    box-shadow: 0 0 0 3px rgba(79, 156, 255, 0.16);
}

.field-icon {
    color: #a3aec0;
    display: flex;
    flex: none;
}

.field input {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    font-size: 15px;
    color: #2c3e50;
    background: transparent;
    height: 100%;
}

.field input::placeholder {
    color: #b6bfcd;
}

.login-msg {
    margin-bottom: 14px;
    padding: 9px 12px;
    border-radius: 8px;
    font-size: 13px;
    text-align: center;
    background: #fdecea;
    color: #c0392b;
}

#login-submit {
    width: 100%;
    height: 48px;
    border: none;
    border-radius: 10px;
    background: #2f80ed;
    color: #fff;
    font-size: 16px;
    letter-spacing: 2px;
    cursor: pointer;
    transition: background 0.2s;
}

#login-submit:hover {
    background: #2670d3;
}

#login-submit:disabled {
    background: #9bbdf0;
    cursor: not-allowed;
}

.copyright {
    margin-top: 18px;
    text-align: center;
    color: #7b8ba3;
    font-size: 12px;
}